Klutz (7)
I believe the answer is:
palooka
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">klutz</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for palooka that I've seen before include "Stupid oaf" , "Bungler" , "clumsy type" .)