Warty critter (4)
I believe the answer is:
toad
'warty critter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for toad that I've seen before include "Hateful person; animal" , "Common amphibian" , "Small amphibian" , "Wind in Willows hall-owner" , "Tailless amphibian" .)