The most common and most likely answer to this crossword clue is the 7 letter word SINGLES
I've seen this crossword clue in The Daily Telegraph
S
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N
G
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S
More clues leading to the result SINGLES
Buddy explains!

The straight part
We know that "Runs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case runs = singles.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 SINGLES mean?
SINGLES noun- A 45 RPM vinyl record with one song on side A and one on side B.
- A popular song released and sold (on any format) nominally on its own though usually having at least one extra track.
- One who is not married or does not have a romantic partner.
- A score of one run.
- A hit in baseball where the batter advances to first base.
- A tile that has a different value (i.e. number of pips) at each end.
- A bill valued at $1.
- A one-way ticket.
- A score of one point, awarded when a kicked ball is dead within the non-kicking team's end zone or has exited that end zone. Officially known in the rules as a rouge.
- (chiefly in the plural) A game with one player on each side, as in tennis.
- One of the reeled filaments of silk, twisted without doubling to give them firmness.
- A handful of gleaned grain.
- A floating-point number having half the precision of a double-precision value.
- To identify or select one member of a group from the others; generally used with out, either to single out or to single (something) out.
- To get a hit that advances the batter exactly one base.
- To thin out.
- (of a horse) To take the irregular gait called singlefoot.
- To sequester; to withdraw; to retire.
- To take alone, or one by one.
- A game between individual players
- Of or pertaining to unmarried people.
- Bicycle tires with the inner tube permanently stitched inside the casing.