Found everyone playing (4)
I believe the answer is:
cast
'found' is the definition.
(I've seen this in other clues)
'everyone playing' is the wordplay.
I cannot really understand how this works, but
'playing' could be 'as' (I've seen this in other clues) and 'as' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cast that I've seen before include "Provided players" , "protection from injury" , "Select actors for play or film" , "Throw; shed; mould" , "Complement of actors in a play" .)