Plant resembling the pansy (5)

I believe the answer is:

tansy

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'plant' is the definition.
(tansy is a kind of plant)

I don't understand the rest of the clue.

(Other definitions for tansy that I've seen before include "Plant with yellow flowers" , "Aromatic wild plant" , "Flowering plant" , "plant for medicinal use" , "Herb used as seasoning" .)

I've seen this clue in the Evening Standard.

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