Crush, put down (8)
I believe the answer is:
suppress
This clue is a double definition.
'crush' is the first definition.
(synonyms)
'put down' is the second definition.
(I've seen this before)
(Other definitions for suppress that I've seen before include "Prevent from being publicised" , "Forcibly keep down" , "Prevent the dissemination of, information say" , "Crush, put down" , "squash" .)