Criticise a show, we hear (6)
I believe the answer is:
review
'criticise' is the definition.
(thesaurus)
'a show we hear' is the wordplay.
'a show' becomes 'revue' (revue is a kind of show).
'we hear' indicates a 'sounds like' (homophone) clue.
'revue' sounds like 'REVIEW'.
(Other definitions for review that I've seen before include "General survey of a plan" , "Write a critique of" , "Re-evaluation or critique" , "notice" , "Take stock" .)