Large clumsy person (4)
I believe the answer is:
hulk
'large clumsy person' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hulk that I've seen before include "Remains of ship; Incredible comic monster" , "Shipwreck" , "Dismantled ship" , "Unwieldy man" , "old prison ship" .)