Crossword Genius

Sound highly owlish! (7)

Ross

I believe the answer is:

screech

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for screech that I've seen before include "cry of horror" , "Cry raucously; type of owl" , "High pitched shout" , "Sudden shrill cry" , "Yell" .)

I've seen this clue in the Evening Standard.
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