Klutzy sort (3)
I believe the answer is:
oaf
'klutzy sort' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oaf that I've seen before include "Bumpkin" , "Lout, lummox" , "An ill-mannered lout" , "Lout, dullard" , "Clumsy fool" .)