Fewer of animal (3)

I believe the answer is:

ewe

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

'animal' is the definition.
(female sheep)

'fewer' is the wordplay.
'EWE' is hidden in amongst the letters.
However, I'm not sure how this is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for ewe that I've seen before include "Ruminant" , "Wool producer" , "Source of milk" , "Female animal" , "Language" .)

I've seen this clue in The Mirror.

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