Crossword Genius

Cow's reproductive cells not treated by sound waves (7)

Ross

I believe the answer is:

overawe

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'cow's' is the definition.
(synonyms)

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

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(Other definitions for overawe that I've seen before include "Cow" , "Subdue, creating fear and wonder" , "Impress someone into silence" , "bully" , "Browbeat" .)

I've seen this clue in The Independent.
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