Tough no longer working in theatre? (8)
I believe the answer is:
exacting
'tough' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for exacting that I've seen before include "Demanding in effort - or money" , "Greatly demanding" , "Tough" , "Making great demands, requiring real effort" , "Requiring hard work and attention" .)