What the writers are fighting over? (5,5)

I believe the answer is:

scrap paper

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'what the' is the definition.
I can't tell whether this defines the answer.

'writers are fighting over?' is the wordplay.
'writers are' becomes 'paper' (I am not sure about this - if you are sure you should believe this answer much more).
'fighting' becomes 'scrap'.
'over?' says to put letters next to each other.
'paper' after 'scrap' is 'SCRAP PAPER'.

Can you help me to learn more?

(Other definitions for scrap paper that I've seen before include "What shamefaced News International decided to do" , "Make jottings on this!" , "somewhere to make notes" .)

I've seen this clue in the Evening Standard.

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