Irritate a plant (6)

I believe the answer is:

nettle

I believe this clue is a double definition.

'irritate' is the first definition.
(I know that irritate can be written as nettle)

'a plant' is the second definition.
The answer is an example.

(Other definitions for nettle that I've seen before include "sample of herbal tea?" , "Irritate - weed" , "Annoy - stinger" , "To be annoying" , "Bug" .)

I've seen this clue in The Daily Express.

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