Clumsy, incompetent (5)
I believe the answer is:
inept
This clue is a double definition.
'clumsy' is the first definition.
(I know that clumsy can be written as inept)
'incompetent' is the second definition.
(similar in meaning)
(Other definitions for inept that I've seen before include "Incompetent or gauche" , "Silly - unskilled - unsuitable" , "Hopelessly incapable" , "Clumsy and incompetent" , "Lacking any competence" .)