Players complained loudly (4)
I believe the answer is:
side
'players' is the definition.
(eg a football side)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for side that I've seen before include "Edge - aspect - team" , "Position to the right or left of" , "pretentious attitude" , "Pretentious air" , "faction" .)