Crossword Genius

Irritate at the plant (6)

Ross

I believe the answer is:

nettle

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nettle that I've seen before include "Grasp it firmly and it will not sting" , "Provoke" , "Upset" , "Annoy; common weed" , "Sting or annoy with the plant" .)

I've seen this clue in The Mirror.
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