Bruce Banner's alter ego (4)
I believe the answer is:
hulk
'bruce banner's alter ego' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hulk that I've seen before include "Wrecked and abandoned ship" , "Clumsy person; old ship" , "Derelict vessel" , "Unwieldy man" , "Large clumsy person; stripped ship" .)