Fellow to make fun of (3)
I believe the answer is:
guy
I believe this clue is a double definition.
'fellow' is the first definition.
(I've seen this before)
'make fun of' is the second definition.
('guy' can be a synonym of 'make fun of')
'to' is the link.
(Other definitions for guy that I've seen before include "Bloke" , "Steadying rope" , "Male" , "Rope; man" , "Bonfire night effigy" .)