Crocodilian (6)
I believe the answer is:
cayman
'crocodilian' is the definition.
(I know that cayman is a type of crocodilian)
This is all the clue.
(Other definitions for cayman that I've seen before include "Alligator-like reptile; Amy can (anagram)" , "Type of crocodile and Caribbean islands" , "Member of crocodile family" , "Alligator - island" , "Crocodilian animal" .)