Crossword Genius

Hiss with anger, as a horse! (4)

Ross

I believe the answer is:

sire

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But I can't explain it at all! Could you help me understand?

(Other definitions for sire that I've seen before include "Stallion; beget" , "Male parent of an animal" , "Make children" , "Male parent of a horse, for example" , "Male parent of, say, horse" .)

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