Paper not completely creamlaid (4)
I believe the answer is:
ream
'paper' is the definition.
(a ream is an amount of paper)
'not completely creamlaid' is the wordplay.
'not completely' indicates the answer is hidden within the clue.
'REAM' is hidden in the letters of 'creamlaid'.
(Other definitions for ream that I've seen before include "480 sheets of paper" , "500 sheets, perhaps" , "Lots of paper" , "Make hole larger - lot of paper" , "Twenty quires of paper" .)