Crossword Genius

Passionate old king was beheaded (4)

Ross

I believe the answer is:

avid

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'passionate' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for avid that I've seen before include "Ardent about diva" , "Greedy - enthusiastic" , "Extremely enthusiastic" , "Burning" , "Greedily eager" .)

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