One whose business is blooming? (6)

I believe the answer is:

grower

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'one' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

I can't explain the rest of the clue.

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(Other definitions for grower that I've seen before include "Produce provider" , "One cultivating plants" .)

I've seen this clue in the Evening Standard.

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