Female horse (4)

I believe the answer is:

mare

'female horse' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for mare that I've seen before include "For classicists, sea" , "Nag" , "Ream (anag)" , "Adult female zebra" , "Female quadruped" .)

I've seen this clue in the Evening Standard, The Times, the Universal, The Independent, The Mirror, the USA Today, the King Feature Syndicate, the Newsday, The Telegraph and the LA Times.

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