Pond critter (4)
I believe the answer is:
newt
'pond critter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for newt that I've seen before include "Small, lizard-like amphibian" , "The epitome of drunkenness" , "Went (anag.)" , "Medical worker" , "Pond creature" .)