Happen to be in crowd at game? (7)
I believe the answer is:
turnout
'crowd at game?' is the definition.
'turnout' can be an answer for 'crowd' (I've seen this before). I'm not certain of the 'at game?' bit.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for turnout that I've seen before include "Numbers attending an event" , "assembly" , "Number voting" , "those who showed up for meeting" , "The number of people who came to a function" .)