Crossword Genius

Elusive flower? (9)

Ross

I believe the answer is:

pimpernel

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

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

Can you help me to learn more?

(Other definitions for pimpernel that I've seen before include "Baroness Orczy's scarlet flower?" , "The Scarlet ..., aka Sir Percy Blakeney" , "Target for revolutionary French" , "Low-growing plant" , "associated with Blakeney?" .)

I've seen this clue in The Telegraph.
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