Black out, perhaps, on the left turn (6)
I believe the answer is:
redact
'black out' is the definition.
(I've seen this in another clue)
'on the left turn' is the wordplay.
'on the left' becomes 'red' (red can mean leftwing).
'turn' becomes 'act' (theatre).
'red'+'act'='REDACT'
'perhaps' acts as a link.
(Other definitions for redact that I've seen before include "Prepare for publication" , "Edit and censor" , "Prepare to publish" , "put into literary form" , "Traced badly to edit" .)