Front of a sheet of paper (5)
I believe the answer is:
recto
'front of a sheet of paper' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for recto that I've seen before include "The right-hand page or leaf of a book" , "one side" , "front of leaf" , "One page" , "Odd-numbered page" .)