What does the cryptic crossword clue "Grass and cannabis elevated many pipes (8)" mean?

The definition is "many pipes". The wordplay uses a reversal. REEDS (synonym="grass") + POT (reversal="weed") = REEDSTOP The answer is REEDSTOP.

Grass and cannabis elevated many pipes (8)

Independent Cryptic #11861 | 1 Down | 2024-10-15 flower