Cancels lines in returned paper (5)

I believe the answer is:

nulls

'cancels' is the definition.

'lines in returned paper' is the wordplay.
'lines' becomes 'll' (I've seen this in other clues**).
'in' is an insertion indicator.
'returned' says the letters should be written in reverse.
'paper' becomes 'sun' (The Sun, UK newspaper).
'sun' reversed gives 'nus'.
'll' placed inside 'nus' is 'NULLS'.

I've seen this clue in The Independent.

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