Crossword Genius

Keen man deposing leader (4)

Ross

I believe the answer is:

avid

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'keen' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for avid that I've seen before include "Burning" , "Greedy - enthusiastic" , "Keen or greedy" , "passionate" , "Eager like diva" .)

I've seen this clue in The Sun.
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