Crossword Genius

Brought back king to protect knight, sacrificing bishop (5)

Ross

I believe the answer is:

redux

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

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for redux that I've seen is " Brought back".)

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