Clumsy, bungling (5)
I believe the answer is:
inept
I believe this clue is a double definition.
'clumsy' is the first definition.
(I know that clumsy can be written as inept)
'bungling' is the second definition.
(synonyms)
(Other definitions for inept that I've seen before include "Hopelessly incapable" , "Lacking any competence" , "Incompetent and ineffectual" , "Unsuitable, clumsy" , "Clumsy - silly" .)