What does the cryptic crossword clue "They are placed inside small oxygen-supplying equipment (6)" mean?

The wordplay uses a charade (building blocks). S (synonym="small") + TENTS (synonym="oxygen-supplying equipment") = STENTS The answer is STENTS.

They are placed inside small oxygen-supplying equipment (6)

Guardian Cryptic #29347 | 2 Down | 2024-04-03 flower