Tease — nincompoop (4)
I believe the answer is:
twit
I believe this is a double definition.
'tease' is the first definition.
(I know that tease can be written as twit)
'nincompoop' is the second definition.
(I've seen this in another clue)
(Other definitions for twit that I've seen before include "Idiot; tease" , "Silly person; tease" , "Silly fool" , "Silly ass" , "Bait - fool" .)