What does the cryptic crossword clue "Cadge trousers – they’re useful for travellers (6,4)" mean?

The wordplay uses a charade (building blocks). SPONGE (synonym="cadge") + BAGS (synonym="trousers") = SPONGEBAGS The answer is SPONGEBAGS.

Cadge trousers – they’re useful for travellers (6,4)

Guardian Cryptic #29600 | 18 Across | 2025-01-24 flower