Crossword Genius

A noble king covers the dark (6)

Ross

I believe the answer is:

knight

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in the Sydney Morning Herald.
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