Leporine leapers (5)
I believe the answer is:
hares
'leporine leapers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hares that I've seen before include "Fleet-footed animals" , "Fast-running animals" , "Long-eared animals" , "Fast animals" , "Swift long-eared mammals" .)