Crossword Genius

An improvement in discipline (10)

Ross

I believe the answer is:

correction

This clue is a double definition.

'an improvement' is the first definition.
(I know that correction is a type of improvement)

'discipline' is the second definition.
(I know that discipline can be written as correction)

'in' acts as a link.

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