Crossword Genius

Stopping for a smaller number of sheep (3)

Ross

I believe the answer is:

ewe

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

'sheep' is the definition.
(a ewe is a female sheep)

'stopping for a smaller number' is the wordplay.
I cannot quite understand how this works, but
'number' could be 'e' (e is a kind of number) and 'e' is located in the answer.
The remaining letters 'we' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'of' is the link.

Can you help me to learn more?

(Other definitions for ewe that I've seen before include "Partner to ram" , "Wool producer" , "Directions" , "creature" , "Sheep found in sewer" .)

I've seen this clue in The Times.
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