Never designs original formal attire (7,5)
I believe the answer is:
evening dress
'formal attire' is the definition.
(I've seen this before)
'never designs original' is the wordplay.
'original' indicates anagramming the letters.
'never'+'designs'='neverdesigns'
'neverdesigns' with letters rearranged gives 'EVENING-DRESS'.
(Other definitions for evening dress that I've seen before include "Formal dinner wear" , "Formal attire" , "DJ" .)