Fancy going topless for paper (4)
I believe the answer is:
ream
'paper' is the definition.
(I've seen this before)
'fancy going topless' is the wordplay.
'fancy' becomes 'dream' (I've seen this before).
'going topless' means to remove the first letter.
'dream' with its first letter removed is 'REAM'.
'for' is the link.
(Other definitions for ream that I've seen before include "Lots of paper" , "Five hundred sheets of paper" , "Widen (hole); quantity of paper" , "Quantity of paper, about 500 sheets" , "516 sheets of paper" .)