Hatch fool briefly stuffed with paper (5,2)
I believe the answer is:
dream up
'hatch' is the definition.
(I know that hatch can be written as dream up)
'fool briefly stuffed with paper' is the wordplay.
'fool briefly' becomes 'dup' (I can't explain this - if you can you should give a lot more credence to this answer).
'stuffed with' means one lot of letters goes inside another (some letters get stuffed inside).
'paper' becomes 'ream' (a ream is an amount of paper).
'dup' enclosing 'ream' is 'DREAM UP'.
Can you help me to learn more?
(Other definitions for dream up that I've seen before include "Imagine, invent" , "Invent through imagination" , "'Devise or invent (5,2)'" , "Invent (something)" , "Concoct" .)