Swift’s ‘brute in human form’ (5)

I believe the answer is:

yahoo

(Other definitions for yahoo that I've seen before include "Boorish lout (after Swift)" , "Rude or brutish person" , "Lout (in Gulliver's Travels)" , "Brutish race of people in "Gulliver's Travels"" , "Brutal lout" .)

I've seen this clue in The Guardian.

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