What does the cryptic crossword clue "Times when naturism retreat rejected trousers (5)" mean?

The definition is "Times". The wordplay uses a hidden word. Hidden reversed in "times when naturiSM RETreat rejected trousers" The answer is TERMS.

Times when naturism retreat rejected trousers (5)

Guardian Cryptic #29054 | 23 Across | 2023-04-26 flower