Tease the silly fellow (4)
I believe the answer is:
twit
I believe this clue is a double definition.
'tease' is the first definition.
(synonyms)
'the silly fellow' is the second definition.
(I've seen this in another clue)
(Other definitions for twit that I've seen before include "Silly ass" , "Tease - fool" , "Taunt; fool" , "Nincompoop" , "dunce" .)