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River renamed by Alf? (3)

Ross

I believe the answer is:

fal

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'river' is the definition.
(Cornish river)

'renamed by alf?' is the wordplay.
'alf' anagrams to 'FAL'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for fal that I've seen before include "Cornish river" , "Flower" .)

I've seen this clue in the Evening Standard.
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