For legal reasons, conceal bloody deed (6)
I believe the answer is:
redact
'for legal reasons conceal' is the definition.
I can't judge whether this definition defines the answer.
'bloody deed' is the wordplay.
'bloody' becomes 'red'.
'deed' becomes 'act' (an action).
'red'+'act'='REDACT'
Can you help me to learn more?
(Other definitions for redact that I've seen before include "Traced badly to edit" , "Prepare to publish" , "Edit for publication" , "put into literary form" , "Edit and censor" .)