Group of actors in rep out for a change (6)
I believe the answer is:
troupe
'group of actors' is the definition.
(I've seen this before)
'rep out for a change' is the wordplay.
'for a change' indicates anagramming the letters.
'rep'+'out'='repout'
'repout' anagrammed gives 'TROUPE'.
'in' is the link.
(Other definitions for troupe that I've seen before include "Performing company" , "travelling band" , "Our pet (anag) - company of performers" , "Dance company" , "Company of theatrical performers" .)