Crossword Genius

Poet Edmund eats soft food that comes in rolls (9)

Ross

I believe the answer is:

wallpaper

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'poet edmund eats soft food that comes in rolls' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'soft food that comes in rolls' is the wordplay.
'soft food' becomes 'pap' (I've seen this in another clue).
'that comes in' means one lot of letters goes inside another.
'rolls' becomes 'waller' (I am not sure about this - if you are sure you should believe this answer much more).
'pap' placed within 'waller' is 'WALLPAPER'.

Can you help me to learn more?

(Other definitions for wallpaper that I've seen before include "Bland and unoriginal stuff - for decorating" , "Mural decoration" , "Screen background" , "Pasted covering" .)

I've seen this clue in The Times.
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