One side of the paper a clergyman does not finish (5)
I believe the answer is:
recto
'one side' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for recto that I've seen before include "Side of paper" , "No leaves left" , "one side" , "Right-hand page of an open book" , "Page three, for example" .)