Weedkiller (9)

I believe the answer is:

herbicide

'weedkiller' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for herbicide that I've seen before include "Chemical agent that destroys plants" , "Substance toxic to plants" , "Weedkiller" , "Vegetation destroyer" , "Plant killer" .)

I've seen this clue in the Sydney Morning Herald.

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