Players moaned audibly (4)
I believe the answer is:
side
'players' is the definition.
(I've seen this before)
'moaned audibly' is the wordplay.
'moaned' becomes 'sighed' (I've seen this before).
'audibly' shows a homophone (sound like).
'sighed' is a homophone of 'SIDE'.
(Other definitions for side that I've seen before include "Not the main" , "group of players" , "Bank" , "Manchester United, for example?" , "Team - pretentious manner" .)