Leaping amphibian (4)
I believe the answer is:
frog
'leaping amphibian' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for frog that I've seen before include "One of Ranidae" , "Obstruction, in throat" , "Adult tadpole" , "Amphibian (lodged in the throat?)" , "Amphibious jumper" .)