A flower changes, in short, Penelope’s heart (5)

I believe the answer is:

peony

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'a flower' is the definition.
(peony is a kind of flower)

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

(Other definitions for peony that I've seen before include "Garden flower" , "Bloom" , "Herbaceous flower" , "Plant with large red, white or pink flowers" .)

I've seen this clue in The Hindu.

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