African antelopes (4)
I believe the answer is:
gnus
'african antelopes' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for gnus that I've seen before include "runners in Africa" , "Snug (anag) -- wildebeest" , "Strange guns for the beasts" , "Large African antelopes" , "African runners" .)