Paragraph's opening covered and checked (7)

I believe the answer is:

proofed

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'checked' is the definition.
(proofing is a kind of checking)

'paragraph's opening covered' is the wordplay.
'paragraph's opening' becomes 'p' (I can't explain this - if you can you should give a lot more credence to this answer).
'covered' becomes 'roofed' (roofing is a kind of covering).
'p'+'roofed'='PROOFED'

'and' is the link.

Can you help me to learn more?

(Another definition for proofed that I've seen is " Checked".)

I've seen this clue in The Telegraph.

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