The Stour, for instance, some would call a flower (5)

I believe the answer is:

river

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'flower' is the definition.
(A river flows and is therefore a flower)

I don't understand the rest of the clue.

(Other definitions for river that I've seen before include "Such as the Nile or Amazon" , "Eg, Thames or Nile" , "Eg, the Rhine" , "eg Aire" , "x or y, so to speak" .)

I've seen this clue in the Evening Standard.

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