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A short one I don't understand:

18A A source of lines one's found in manuscript. (4)

_ I _ S

It looks to be MISS (I'S inside MS) but why's that a source of lines?

Any suggestions welcome

Lines as a school punishment (it's so long since I was there I don't know if still relevant - other than the intro to The Simpsons - with "Miss" being the teacher?

With the Simpsons in mind, 'Doh!' I guess that must be it. Thank you.