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Its being on the river hardly needs mention (6)

Ross

I believe the answer is:

henley

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'mention' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I can't see?

I can't explain the rest of the clue.

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(Other definitions for henley that I've seen before include "rowing here" , "Annual regatta town" , "River town" .)

I've seen this clue in the Evening Standard.
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