Crossword Genius

Courage? Makes an error about one retreating (6)

Ross

I believe the answer is:

spirit

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'courage?' is the definition.
(courage is a kind of spirit)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for spirit that I've seen before include "Mettle" , "Ghost or animation" , "Incorporeal supernatural being" , "Jinn" , "Soul - ethos" .)

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