Aquatic salamander (4)
I believe the answer is:
newt
'aquatic salamander' 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 "Went (anag.)" , "Amphibious salamander" , "Small tailed amphibian" , "Went to find kind of water lizard" , "Medical worker" .)