After making a show, they may hand in their notice (7)
I believe the answer is:
critics
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for critics that I've seen before include "Professional reviewers of the arts" , "They judge works of art" , "Professionals who make judgments on works of art" , "We review" , "They analyse works of art" .)