Crossword Genius

Three-quarter moon is low (3)

Ross

I believe the answer is:

moo

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

I can't explain the rest of the clue.

Can you help me to learn more?

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

I've seen this clue in The Sun.
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