A trite form of dress (6)
I believe the answer is:
attire
'dress' is the definition.
(I know that dress can be written as attire)
'a trite form' is the wordplay.
'form' indicates anagramming the letters (another form of the letters).
'trite' with letters rearranged gives 'ttire'.
'a'+'ttire'='ATTIRE'
'of' acts as a link.
(Other definitions for attire that I've seen before include "Garments" , "Wear" , "Habit" , "Prepare" , "12" .)