Bungler (3)
I believe the answer is:
oaf
'bungler' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oaf that I've seen before include "Lout, lummox" , "A clumsy or stupid person" , "Clumsy fool" , "Bumpkin" , "Awkward, clumsy person" .)