Composition of paper? (5)
I believe the answer is:
essay
I believe this clue is a double definition.
'composition' is the first definition.
(I've seen this before)
'paper?' is the second definition.
(paper is a kind of essay)
'of' acts as a link.
(Other definitions for essay that I've seen before include "School compeosition" , "Short literary piece: attempt" , "Attempt, try" , "Thesis" , "Attempt - piece of writing" .)