Dues to be paid for players not starting (4)
I believe the answer is:
subs
This clue is a double definition.
'dues to be paid' is the first definition.
(subscription payments due to an organisation)
'players not starting' is the second definition.
(substitutes aren't on the pitch when a game starts)
'for' acts as a link.
(Other definitions for subs that I've seen before include "Club members' payments" , "Underwater vessels (abbr)" , "Advance payments" , "Reserves at football (sl.)" , "Players in reserve" .)