Man of darkness, according to report (6)
I believe the answer is:
Here is my best explanation:
'man' is the definition.
(I've seen this before)
'darkness according to report' is the wordplay.
'darkness' becomes 'night' (night is a kind of darkness).
'according to report' indicates a 'sounds like' (homophone) clue.
'night' is a homophone of 'KNIGHT'.
'of' is the link.
(Other definitions for knight that I've seen before include "Heroic champion", "Man on board", "board member", "Ladies' champion", "rider looking for adventure?", "He's a Sir in the UK", "... for example, Tippett", "Holder of non-hereditary title in UK", "Chess piece shaped like horse's head" and "Dub".)