Maladroit fiance spat regularly (5)
I believe the answer is:
inept
'maladroit' is the definition.
(maladroit can mean inept or clumsy)
'fiance spat regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'fiance'+'spat'='fiancespat'
The alternate letters of 'fiancespat' are 'INEPT'.
(Other definitions for inept that I've seen before include "Clumsy and incompetent" , "Hopelessly incapable" , "Amateurish" , "Foolish" , "Clumsy - silly" .)