Complete costume for a group of players (8)
I believe the answer is:
ensemble
This clue is a double definition.
'complete costume' is the first definition.
'a group of players' is the second definition.
(I've seen this before)
'for' acts as a link.
(Other definitions for ensemble that I've seen before include "Small group or complete costume" , "Group of musicians or set of clothes" , "supporting cast" , "Musical company" , "team" .)