Crossword Genius

London flower? (6)

Ross

I believe the answer is:

thames

'london flower?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for thames that I've seen before include "Windsor's river" , "The Ma's in London" , "capital banker" , "The Isis at Oxford" , "London's river (6)" .)

I've seen this clue in The Mirror.
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