What does the cryptic crossword clue "Humorous ridicule which affronted nurses (5)" mean?

The definition is "Humorous ridicule". The wordplay uses a hidden word. Hidden in "humorous ridicule whiCH AFFronted nurses" The answer is CHAFF.

Humorous ridicule which affronted nurses (5)

Times Cryptic #28643 | 1 Down | 2023-06-30 flower