Collect new paper, missing one page (4)
I believe the answer is:
reap
'collect' is the definition.
(reaping is a kind of collecting)
'new paper missing one page' is the wordplay.
'new' indicates an anagram.
'missing' suggests deleting specific letters.
'one page' becomes 'p'.
'paper' with 'p' taken out is 'aper'.
'aper' is an anagram of 'REAP'.
(Other definitions for reap that I've seen before include "''As you sow, so you . . . .'' (4)" , "Get -- derive" , "Gather 23dn" , "Harvest, garner" , "Cut the corn" .)