Smooth enveloping bovine sound (3)

I believe the answer is:

moo

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

'sound' is the definition.
(moo is a kind of sound)

'smooth enveloping bovine' is the wordplay.
'MOO' is hidden within the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

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

I've seen this clue in The Mirror.

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