Immature newt (3)
I believe the answer is:
eft
'immature newt' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eft that I've seen before include "Small amphibian" , "Young newt" , "Little creature" , "Kind of newt found in clefts" , "Slimy creature" .)