It fixes where you find crossword, say, with some speed (9)
I believe the answer is:
paperclip
'it fixes' is the definition.
(a paperclip fixes papers together)
'where you find crossword say with some speed' is the wordplay.
'where you find crossword say' becomes 'paper' (as in a crossword in a newspaper).
'with' means one lot of letters go next to another.
'some speed' becomes 'clip' (I've seen this before).
'paper'+'clip'='PAPERCLIP'
(Other definitions for paperclip that I've seen before include "Fastener for documents etc" , "Document fastener" , "Small piece of office equipment" .)