Group of players audibly expressed relief (4)
I believe the answer is:
side
'group of players' is the definition.
(I've seen this before)
'audibly expressed relief' is the wordplay.
'audibly' indicates a 'sounds like' (homophone) clue.
'expressed relief' becomes 'sighed' (gave a sigh of relief).
'sighed' is a homophone of 'SIDE'.
(Other definitions for side that I've seen before include "by no means a front" , "Manchester United, for example?" , "Face - team" , "TV channel" , "Left or right, say" .)