Flowery, but looks promising (4)

I believe the answer is:

rosy

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'promising' is the definition.
(synonyms)

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

(Other definitions for rosy that I've seen before include "Healthy-looking" , "Of the future, promising like flower" , "Blushing - optimistic" , "Promising; hopeful" , "Hopeful; blushing" .)

I've seen this clue in The Irish Times.

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