The most common and most likely answer to this crossword clue is the 7 letter word DOUBLES
I've seen this crossword clue in The Times
D
O
U
B
L
E
S
Buddy explains!

The straight part
We know that "it can be a game for four" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it can be a game for four = doubles.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DOUBLES mean?
DOUBLES noun- Twice the number, amount, size, etc.
- A person who resembles and stands in for another person, often for safety purposes
- A drink with two portions of alcohol.
- A ghostly apparition of a living person; doppelgänger.
- A sharp turn, especially a return on one's own tracks.
- A redundant item for which an identical item already exists.
- A two-base hit.
- A call that increases certain scoring points if the last preceding bid becomes the contract.
- A strike in which the object ball is struck so as to make it rebound against the cushion to an opposite pocket.
- A bet on two horses in different races in which any winnings from the first race are placed on the horse in the later race.
- The narrow outermost ring on a dartboard.
- A hit on this ring.
- A tile that has the same value (i.e., the same number of pips) on both sides.
- A double-precision floating-point number.
- Two competitions, usually one league and one cup, won by the same team in a single season.
- A boat for two scullers.
- The feat of scoring twice in one game.
- (chiefly swimming and track) The feat of winning two events in a single meet or competition.
- A former French coin worth one-sixth of a sou.
- (Guernsey) A copper coin worth one-eighth of a penny.
- Playing the same part on two instruments, alternately.
- A double feast.
- To multiply by two.
- To fold over so as to make two folds.
- To be the double of; to exceed by twofold; to contain or be worth twice as much as.
- To increase by 100%, to become twice as large in size.
- To get a two-base hit.
- (sometimes followed by up) To clench (a fist).
- (often followed by together or up) To join or couple.
- To repeat exactly; copy.
- (often followed by as) To play a second part or serve a second role.
- To turn sharply, following a winding course.
- To sail around (a headland or other point).
- To duplicate (a part) either in unison or at the octave above or below it.
- (usually followed by "on") To be capable of performing (upon an additional instrument).
- To make a call that will double certain scoring points if the preceding bid becomes the contract.
- To double down.
- To cause (a ball) to rebound from a cushion before entering the pocket.
- (followed by for) To act as substitute.
- To go or march at twice the normal speed.
- To multiply the strength or effect of by two.
- To unite, as ranks or files, so as to form one from each two.
- (of a station) To transmit simultaneously on the same channel as another station, either unintentionally or deliberately, causing interference.
- The double time, a marching cadence (pace) approaching running speed.
- A game between pairs of players
- (campanology) bell changes rung on five bells
- A sandwich of Trinidad and Tobago, made with two bara (flat fried bread) filled with curried chickpeas.