Hold back after a fault (7)

I believe the answer is:

reserve

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'hold back' is the definition.
(reserve can mean to keep or hold something back)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for reserve that I've seen before include "Set aside - shyness" , "Kept back stock" , "Hold back" , "cool" , "keep for oneself" .)

I've seen this clue in The Globe and Mail.

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