Big bumbler (3)

I believe the answer is:

oaf

(Other definitions for oaf that I've seen before include "Awkward stupid person" , "Lout, dullard" , "Idiot" , "A clumsy boor" , "Boor or lout" .)

I've seen this clue in The Wall Street Journal, the Newsday.com and the Newsday.

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