Odd-numbered page (5)
I believe the answer is:
recto
'odd-numbered page' 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 "one side" , "No leaves left" , "Odd-numbered page" , "Right-hand page of an open book" , "Page three, for example" .)