Pachyderms (9)
I believe the answer is:
elephants
'pachyderms' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elephants that I've seen before include "The planes (anag.)" , "big game" , "Largest animals" , "Animals from the palest hen" , "Five-toed pachyderms" .)