A noble king covers the dark (6)
I believe the answer is:
knight
'a noble' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'king covers the dark' is the wordplay.
'king' becomes 'K' (abbreviation for king in chess).
'covers' is a charade indicator (letters next to each other).
'the dark' becomes 'night' (it's dark at nighttime).
'k'+'night'='KNIGHT'
Can you help me to learn more?
(Other definitions for knight that I've seen before include "Dub" , "Honorary title" , "Heroic champion" , "Holder of non-hereditary title in UK" , "Gallant" .)