A trite form of clothing (6)
I believe the answer is:
attire
'clothing' is the definition.
(I know that attire is a type of clothing)
'a trite form' is the wordplay.
'form' is an anagram indicator (another form of the letters).
'trite' is an anagram of 'ttire'.
'a'+'ttire'='ATTIRE'
'of' is the link.
(Other definitions for attire that I've seen before include "(To) dress; fine clothes" , "Habit" , "Special clothing" , "12" , "Fine/formal clothes" .)