Amphibian that can regenerate eye lenses (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
newt
(Other definitions for newt that I've seen before include "Small often colourful salamander of the Northern Hemisphere" , "The epitome of drunkenness" , "Went to find amphibian" , "Ask" , "Amphibian such as the salamander" .)