Nanny : goat :: ___ : sheep (3)

I believe the answer is:

ewe

I believe this clue is a double definition.

'nanny goat' is the first definition.
(thesaurus)

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

(Other definitions for ewe that I've seen before include "Lamb's dam" , "Directions" , "Palindrome for a female sheep" , "creature" , "She'll provide material to knit" .)

I've seen this clue in The New York Times.

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