What does the cryptic crossword clue "It’s hot in Pacific location – you must discard a bit of clothing (5)" mean?

The wordplay uses a container (one word inside another). H (synonym="hot") in TONG (synonym="TONG") = THONG The answer is THONG.

It’s hot in Pacific location – you must discard a bit of clothing (5)

Guardian Cryptic #29481 | 23 Down | 2024-09-06 flower