Crossword Genius

Parisians wouldn't call it a flower, so nor will I! (5)

Ross

I believe the answer is:

seine

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for seine that I've seen before include "French river -- type of fishing net" , "Paris's river" , "Parisian river" , "Second longest river in France" , "Paris river" .)

I've seen this clue in the Evening Standard.
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