Crossword Genius

Fewer round mammal (3)

Ross

I believe the answer is:

ewe

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

'round mammal' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?

'fewer' is the wordplay.
'EWE' is hidden in amongst the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for ewe that I've seen before include "One needing pastoral care" , "21a [SHEEP]" , "A palindromic sheep" , "Lamb's dam" , "Partner to ram" .)

I've seen this clue in The Mirror.
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