Can opposing players let go? (5)
I believe the answer is:
loose
'let go?' is the definition.
(loosing is a kind of letting go)
'can opposing players' is the wordplay.
'can' becomes 'loo' (loo is a kind of can).
'opposing players' becomes 'se'.
'loo'+'se'='LOOSE'
(Other definitions for loose that I've seen before include "Unfettered" , "Release" , "Water heater" , "Not fitting tightly" , "Unsecured; dissolute" .)