Crossword Genius

Ros? from The Rhone? (6)

Ross

I believe the answer is:

flower

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'ros? from the rhone?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

This is the entire clue.

Can you help me to learn more?

(Other definitions for flower that I've seen before include "Garden plant" , "bloomer" , "rose, perhaps" , "Plant cultivated for blossoms" , "River" .)

I've seen this clue in the Irish Times.
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