Swiftian brute (5)
I believe the answer is:
yahoo
'swiftian brute' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yahoo that I've seen before include "expression of delight" , "Uncouth person" , "Boorish lout (after Swift)" , "Gulliver's animal in human form" , "Boorish louts" .)