Inappropriate sort of paint (5)
I believe the answer is:
inapt
'inappropriate' is the definition.
(I've seen this in another clue)
'sort of paint' is the wordplay.
'sort of' indicates an anagram.
'paint' with letters rearranged gives 'INAPT'.
(Other definitions for inapt that I've seen before include "badly judged" , "Not fit, unsuitable" , "Not proper" , "It's clumsy" , "Unsuited" .)