New paint, not suitable (5)
I believe the answer is:
inapt
'not suitable' is the definition.
(I've seen this before)
'new paint' is the wordplay.
'new' indicates anagramming the letters.
'paint' with letters rearranged gives 'INAPT'.
(Other definitions for inapt that I've seen before include "not seemly" , "Not suitable or appropriate" , "not fit for purpose" , "Cartoon duck" , "Far from fit" .)