Unsuitable order for paint (5)
I believe the answer is:
inapt
'unsuitable' is the definition.
(I've seen this before)
'order for paint' is the wordplay.
'order for' indicates anagramming the letters.
'paint' anagrammed gives 'INAPT'.
(Other definitions for inapt that I've seen before include "Not fitting" , "Not fit, unsuitable" , "Ill-suited" , "Far from fit" , "Useless" .)