What does the cryptic crossword clue "Cabaret dancing queen is 17ac (4-5)" mean?

The wordplay uses an anagram. CRABEAT (synonym="CRABEAT") + ER (synonym="‘queen’") = CRABEATER The answer is CRABEATER.

Cabaret dancing queen is 17ac (4-5)

Guardian Cryptic #29528 | 21 Across | 2024-10-31 flower