Crossword Genius

School punishment in writing poetry? (5)

Ross

I believe the answer is:

lines

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

'writing poetry?' is the wordplay.
'writing' becomes 'line' (line is a kind of writing).
'poetry?' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'line'+'s'='LINES'

'in' is the link.

Can you help me to learn more?

(Other definitions for lines that I've seen before include "Skin wrinkles" , "Ranks" , "Marks" , "Wrinkles; rail tracks" , "Actor's text" .)

I've seen this clue in The Sun.
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