School punishment (9)

I think it could be either:

Which length description are you looking for?:

lines

'school punishment' is the definition.
(writing the same thing over and over)

This is all the clue.

(Other definitions for lines that I've seen before include "imposition" , "Wrinkles; rail tracks" , "old-fashioned school punishment" , "Ranks" , "writing done by pupil?" .)

I've seen this clue in The Telegraph, The Guardian, The Independent, The Mirror, The Times and the Evening Standard.

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