What does the cryptic crossword clue "Sun hats, perhaps, where a cab is moving (9)" mean?

The wordplay uses an anagram. anagram of WHERE + A + CAB = BEACHWEAR The answer is BEACHWEAR.

Sun hats, perhaps, where a cab is moving (9)

Daily Mail Cryptic #17445 | 14 Down | 2024-09-13 flower