Morning paper? Not entirely (4)
I believe the answer is:
ream
'morning paper? not entirely' is the definition.
I know that 'paper' relates to this answer.
'morning paper? not entirely' is the wordplay.
'morning' becomes 'rea' (I am not sure about this - if you are sure you should believe this answer much more).
'paper?' becomes 'ms' (abbreviation for manuscript).
'not entirely' means to remove the last letter (most but not all of the word).
'ms' with its last letter taken off is 'm'.
'rea'+'m'='REAM'
Can you help me to learn more?
(Other definitions for ream that I've seen before include "Make hole larger - lot of paper" , "20 quires of paper" , "Widen out (bore)" , "Many sheets - enlarge hole" , "Widen (hole); quantity of paper" .)