Effigy burnt on a bonfire (3)
I believe the answer is:
guy
'effigy burnt on a bonfire' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for guy that I've seen before include "Bloke" , "Male" , "One burned on Nov. fifth" , "Stay - ridicule - chap" , "person in shabby clothes" .)