Extensive cover of quality newspaper (10)

I believe the answer is:

broadsheet

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'quality newspaper' is the definition.
'broadsheet' can be an answer for 'newspaper' (I've seen this before). I am not sure about the 'quality' bit.

'extensive cover' is the wordplay.
'extensive' becomes 'broad' (similar in meaning).
'cover' becomes 'sheet' (sheeting is a kind of covering).
'broad'+'sheet'='BROADSHEET'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for broadsheet that I've seen before include "Our sort of paper" , "Paper that can cover large issue" , "Something big that gets blanket coverage" , "put to bed?" , "[OPPOSITE OF] Tabloid" .)

I've seen this clue in The Irish Times.

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