Crossword Genius

Get rid of knightly combat as Jack leaves (4)

Ross

I believe the answer is:

oust

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'get rid of' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for oust that I've seen before include "Put out, say of office" , "Throw out" , "Unseat" , "Extract" , "Give marching orders" .)

I've seen this clue in The Times.
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