Make amendments to socialist legislation (6)
I believe the answer is:
redact
'make amendments to' is the definition.
(to redact is to edit or censor)
'socialist legislation' is the wordplay.
'socialist' becomes 'red' (red is a kind of socialist).
'legislation' becomes 'act' (I've seen this before).
'red'+'act'='REDACT'
(Other definitions for redact that I've seen before include "Prepare for publication" , "Edit for publication" , "Censor part of a text for security reasons" , "Traced badly to edit" , "put into literary form" .)