Small newt (3)
I believe the answer is:
eft
'small newt' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eft that I've seen before include "Small amphibian" , "Pond creature" , "Swimmer with feeble legs" , "Young newt" , "Juvenile twenty-three Ac; rhymes with sinister" .)