Large land mammal (8)
I believe the answer is:
elephant
'large land mammal' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for elephant that I've seen before include "Jumbo" , "Tusked mammal" , "Pachyderm hunted for ivory" , "Trunked mammal" , "Large animal found in the plane?" .)