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