The bloom of youth (9)

I believe the answer is:

narcissus

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'youth' is the definition.
(I have seen 'Beautiful youth' mean 'narcissus' so perhaps 'youth' could also mean 'narcissus')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for narcissus that I've seen before include "Pale daffodil" , "In Greek myth, a lover of his own beauty" , "Beautiful youth; plant" , "Beautiful fellow" , "Spring-flowering bulb" .)

I've seen this clue in The Globe and Mail.

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