Sentence in bad Norse jokes (3-6)

I believe the answer is:

one-liners

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'jokes' is the definition.
(I know this)

'sentence in bad norse' is the wordplay.
'sentence' becomes 'line' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'bad' indicates anagramming the letters.
'norse' with letters rearranged gives 'oners'.
'line' placed inside 'oners' is 'ONE-LINERS'.

Can you help me to learn more?

(Other definitions for one-liners that I've seen before include "Quips" , "Short gags" .)

I've seen this clue in The Daily Express.

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