Tease silly person (4)
I believe the answer is:
twit
I believe this is a double definition.
'tease' is the first definition.
('twit' can be a synonym of 'tease')
'silly person' is the second definition.
(I've seen this before)
(Other definitions for twit that I've seen before include "Taunt; fool" , "Silly fool" , "dunce" , "Idiot; tease" , "Bait - fool" .)