Temporary work on stage (6)
I believe the answer is:
acting
This clue is a triple definition!
'temporary' is the first definition.
(similar in meaning)
'work' is the second definition.
(thesaurus)
'on stage' is the third definition.
(I've seen this before)
(Other definitions for acting that I've seen before include "stagecraft" , "Cruise will do it" , "Playing like thespian" , "Filling a role on a temporary basis" , "Deputy" .)