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Fellow at Oslo ruined cover page (8)

Ross

I believe the answer is:

foolscap

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'page' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'fellow at oslo ruined cover' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'at' says to put letters next to each other.
'ruined' indicates an anagram.
'cover' becomes 'cap' (capping is a kind of covering).
'oslo' with letters rearranged gives 'ools'.
'f'+'ools'+'cap'='FOOLSCAP'

Can you help me to learn more?

(Other definitions for foolscap that I've seen before include "Cop's foal (anag)" , "One would not be wise to put this on" , "type of paper" , "Paper or book size (from its watermark)" , "something near A4" .)

I've seen this clue in the Sydney Morning Herald.
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