The most common and most likely answer to this crossword clue is the 7 letter word PLAYING
P
L
A
Y
I
N
G
Buddy explains!

The straight part
We know that "Gambling/being in the team" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gambling/being in the team = playing.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 PLAYING mean?
PLAYING verb- To act in a manner such that one has fun; to engage in activities expressly for the purpose of recreation or entertainment.
- To perform in (a sport); to participate in (a game).
- To take part in amorous activity; to make love.
- To act as the indicated role, especially in a performance.
- (heading) To produce music or theatre.
- (heading) To behave in a particular way.
- To move in any manner; especially, to move regularly with alternate or reciprocating motion; to operate.
- To move to and fro.
- To put in action or motion.
- To keep in play, as a hooked fish in order to land it.
- To manipulate, deceive, or swindle someone.
- (gerund of play) An occasion on which something, such as a song or show, is played.