Crossword Genius

A low utterance from a beast (3)

Ross

I believe the answer is:

moo

I'm a little stuck... Click here to teach me more about this clue!

'a low' is the definition.
(both can mean to make the noise of a cow)

'utterance from a beast' is the wordplay.
I cannot really see how this works, but
'from' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
The remaining letters 'mo' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for moo that I've seen before include "Cow's low" , "Irritating woman" , "Cow's call" , "Cartoon sound of a cow" , "Farmyard sound" .)

I've seen this clue in the Evening Standard.
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