Associated with formal writing (8)
I believe the answer is:
literary
'associated with formal writing' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for literary that I've seen before include "Concerning written material" , "Bookish" , "Relating to writing of artistic merit (8)" , "Type of writing of artistic merit" , "Relating to books and other writings" .)