Ex-star replaced by actors playing small parts (6)
I believe the answer is:
extras
'actors playing small parts' is the definition.
I can't judge whether this defines the answer.
'ex-star replaced by' is the wordplay.
'replaced' indicates an anagram.
'by' says to put letters next to each other.
'star' with letters rearranged gives 'tras'.
'ex'+'tras'='EXTRAS'
Can you help me to learn more?
(Other definitions for extras that I've seen before include "Actors hired for crowd scenes" , "Add-ons" , "Crowd scene actors" , "Spear-carriers" , "minor players?" .)