Writers' blocks (8)
I believe the answer is:
notepads
'writers' blocks' is the definition.
'notepads' can be an answer for 'blocks' (I have seen 'Blocks of paper ' mean 'notepads' so perhaps 'blocks' could also mean 'notepads'). I'm not sure about the 'writers'' bit.
'writers' blocks' is the wordplay.
'writers'' becomes 'note' (I can't explain this - if you can you should believe this answer much more).
'blocks' becomes 'pads' (pad is a kind of block).
'note'+'pads'='NOTEPADS'
(Other definitions for notepads that I've seen before include "tablets" , "Blocks of paper" , "computers" .)