Crossword Genius

Evil king's decline (4)

Ross

I believe the answer is:

sink

'decline' is the definition.
(sinking is a kind of declining)

'evil king's' is the wordplay.
'evil' becomes 'sin' (I've seen this before).
'king' becomes 'k'.
'sin'+'k'='SINK'

(Other definitions for sink that I've seen before include "Submerge; basin" , "Go down (in the kitchen?)" , "Fall to the bottom" , "Drop in the ocean?" , "Washing-up place" .)

I've seen this clue in The Times.
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