Crossword Genius

A beastly noise, but quiet, at least (3)

Ross

I believe the answer is:

low

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'least' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for low that I've seen before include "Not high or loud" , "Inferior, cow's call" , "Humble; dejected" , "something from Guernsey?" , "Deep sound of cattle - not high" .)

I've seen this clue in the Evening Standard.
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