What does the cryptic crossword clue "Actor's crashed, swivelling wheel? (6)" mean?

The definition is "wheel?". The wordplay uses an anagram. anagram of ACTOR'S = CASTOR; definition: "wheel?" The answer is CASTOR.

Actor's crashed, swivelling wheel? (6)

Daily Mail Cryptic #17295 | 16 Down | 2024-02-16 flower