Silly rhyme for a girl (4)

I believe the answer is:

lily

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'girl' is the definition.
(girl's name)

I don't understand the rest of the clue.

(Other definitions for lily that I've seen before include "White" , "Fragrant flower" , "Bulbous plant with trumpet-shaped flowers" , "Plant like an amaryllis" , "Flower much associated with funerals" .)

I've seen this clue in the Evening Standard.

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