Antelope with spiral horns (5)
I believe the answer is:
eland
'antelope with spiral horns' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eland that I've seen before include "One browses in the African plain" , "Antelope seen by Africans" , "game animal" , "Spiral-horn antelope" , "Large African antelope with spiral horns" .)