Guy perhaps having topless challenge eating fruit (6)
I believe the answer is:
effigy
'guy perhaps' is the definition.
(guy is a kind of effigy)
'topless challenge eating fruit' is the wordplay.
'topless' means to remove the first letter.
'challenge' becomes 'defy' (defying is a kind of challenging).
'eating' means one lot of letters goes inside another.
'fruit' becomes 'fig' (fig is a kind of fruit).
'defy' with its initial letter taken off is 'efy'.
'efy' going around 'fig' is 'EFFIGY'.
'having' acts as a link.
(Other definitions for effigy that I've seen before include "Sculpted figure of a person" , "A guy, for instance" , "Rough figure of person" , "Graven image" , "Image of a person (Guy Fawkes on 5 November?)" .)