What does the cryptic crossword clue "Two things found in the loo, one blown (3,5)" mean?

The wordplay uses a charade (building blocks). PAN (synonym="PAN") + PIPES (synonym="two things found in the loo") = PANPIPES The answer is PANPIPES.

Two things found in the loo, one blown (3,5)

Guardian Cryptic #29363 | 16 Down | 2024-04-22 flower