Crossword Genius

An amphibian went crazy (4)

Ross

I believe the answer is:

newt

'an amphibian' is the definition.
(newt is a kind of amphibian)

'went crazy' is the wordplay.
'crazy' indicates an anagram.
'went' is an anagram of 'NEWT'.

(Other definitions for newt that I've seen before include "Semiaquatic amphibian" , "Medical worker" , "animal" , "found in pond!" , "Small, lizard-like amphibian" .)

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