Low sound (6)

I think it could be either:

Which length description are you looking for?:

moo

'low sound' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for moo that I've seen before include "Cartoon sound of a cow" , "Cow's low" , "Guernsey noise?" , "Irritating woman" , "Low (of cattle)" .)

I've seen this clue in The New York Times and The Globe and Mail.

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