Howling disguises hooter (3)

I believe the answer is:

owl

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

'hooter' is the definition.
(I've seen this before)

'howling disguises' is the wordplay.
'OWL' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for owl that I've seen before include "Harry Potter's Hedwig, for instance" , "Wise old night-flier" , "Solemn person" , "Nocturnal bird of prey" , "Night person" .)

I've seen this clue in The Mirror.

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