Censor communist law (6)
I believe the answer is:
redact
'censor' is the definition.
(I've seen this before)
'communist law' is the wordplay.
'communist' becomes 'red' (red can informally mean communist).
'law' becomes 'act' (I've seen this before).
'red'+'act'='REDACT'
(Other definitions for redact that I've seen before include "Prepare for publication" , "Edit and censor" , "Edit for publication" , "Censor part of a text for security reasons" , "Traced badly to edit" .)