Locomotory stinging plant invented by John Wyndham (7)

I believe the answer is:

triffid

(Other definitions for triffid that I've seen before include "John Wyndham's alien plant" , "Predatory sci-fi plant" , "Killing growth" , "novel poisoner" , "John Wyndham's lethal walking plant" .)

I've seen this clue in The Times and The Sunday Times.

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