Unqualified and not working properly (9)
I believe the answer is:
downright
'unqualified' is the definition.
(thesaurus)
'not working properly' is the wordplay.
'not working' becomes 'down'.
'properly' becomes 'right' (synonyms).
'down'+'right'='DOWNRIGHT'
'and' is the link.
(Other definitions for downright that I've seen before include "Completely" , "Blatant" , "Absolutely!" , "blunt" , "rank" .)