Mixed paint is out of place (5)
I believe the answer is:
inapt
'out of place' is the definition.
(I've seen this in another clue)
'mixed paint' is the wordplay.
'mixed' is an anagram indicator.
'paint' with letters rearranged gives 'INAPT'.
'is' is the link.
(Other definitions for inapt that I've seen before include "Useless" , "Ill-chosen, not suitable" , "Not fit, unsuitable" , "Improper" , "unqualified" .)