Fold two pages, time to finish second one (5)
I believe the answer is:
pleat
'fold two' is the definition.
'pleat' can be an answer for 'fold' (pleating is a kind of folding). I am not sure about the 'two' bit.
'pages time to finish second one' is the wordplay.
'pages' becomes 'p'.
'time' becomes 't'.
'to' means one lot of letters go next to another (I've seen this in other clues).
'finish second' becomes 'le' (I can't explain this - if you can you should believe this answer much more).
'one' becomes 'a'.
'le'+'a'='lea'
't' put after 'lea' is 'leat'.
'p'+'leat'='PLEAT'
(Other definitions for pleat that I've seen before include "Fold pressed or stitched into cloth" , "Gathering" , "Crease" , "that's tailor-made" , "Flat fold of cloth" .)