Best of the bunch? (6)

I believe the answer is:

flower

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'best' is the definition.
(flower can mean the best or elite)

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

(Other definitions for flower that I've seen before include "Blossom" , "rose, perhaps" , "Bloom" , "Plant cultivated for blossoms" , "prime of life" .)

I've seen this clue in the Evening Standard.

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