Bumpy-skinned amphibian (4)
I believe the answer is:
toad
'bumpy-skinned amphibian' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for toad that I've seen before include "Wind in Willows hall-owner" , "Wind in Willows motorist" , "Warty amphibian" , "Hateful person; animal" , "Ancestral hall on River Bank" .)