Put down what's concerning newspapers? (7)
I believe the answer is:
repress
'put down' is the definition.
(I've seen this before)
'concerning newspapers?' is the wordplay.
'concerning' becomes 're'.
'newspapers?' becomes 'press' (I've seen this before).
're'+'press'='REPRESS'
'what's' is the link.
(Other definitions for repress that I've seen before include "Put in irons, maybe" , "Check" , "keep back" , "Forcibly keep down" , "bottle up" .)