Crossword Genius

Green amphibian with tail cut off (3)

Ross

I believe the answer is:

new

I'm a little stuck... Click here to teach me more about this clue!

'green' is the definition.
(I've seen this in another clue)

'amphibian with tail cut off' is the wordplay.
I cannot quite understand how this works, but
'with' could be 'w' (abbreviation) and 'w' is found in the answer.
The remaining letters 'ne' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for new that I've seen before include "Fresh, recent" , "Seen for the first time" , "Unfamiliar, restored" , "Recently made, etc" , "Modern" .)

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