Dreaming about some paper (4)
I believe the answer is:
ream
'paper' is the definition.
(a ream is an amount of paper)
'dreaming about some' is the wordplay.
'some' says the answer is hidden in the clue.
'REAM' can be found hidden inside 'dreaming about'.
(Other definitions for ream that I've seen before include "Many bits of paper" , "20 quires of paper" , "papers" , "480 sheets of paper" , "Twenty quires of paper" .)