What does the cryptic crossword clue "Poisonous tree left active? Set fire to ‘em, I say (8)" mean?

The definition is "Poisonous tree". The wordplay uses a homophone (sounds like). L (synonym="left") + A (synonym="active") + BURN (synonym="”Set fire to”") + UM (synonym="UM") = LABURNUM; definition: "Poisonous tree" The answer is LABURNUM.

Poisonous tree left active? Set fire to ‘em, I say (8)

Guardian Cryptic #29339 | 17 Down | 2024-03-25 flower

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