Antelope with lyre-shaped horns
I believe the answer is:
impala
'antelope with lyre-shaped horns' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for impala that I've seen before include "Big game" , "prodigious bounder" , "horned beast" , "Graceful antelope" , "One regularly browsing" .)