Crossword Genius

Are they sixty per cent ewes? (5)

Ross

I believe the answer is:

sheep

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'ewes?' is the definition.
(I've seen this in another clue)

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

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(Other definitions for sheep that I've seen before include "Easily led people" , "Ovine animals" , "Cotswolds?" , "Woolly quadruped" , "feature of 21/23 [NATIVITY SCENE]" .)

I've seen this clue in the Evening Standard.
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