Offer page with correction to ‘parosol (8)
I believe the answer is:
proposal
'offer' is the definition.
(I know that proposal is a type of offer)
'page with correction to 'parosol' is the wordplay.
'page' becomes 'p'.
'with' is a charade indicator (letters next to each other).
'correction to' is an anagram indicator.
'parosol' is an anagram of 'roposal'.
'p'+'roposal'='PROPOSAL'
(Other definitions for proposal that I've seen before include "A suggestion, perhaps of marriage" , "put before the union?" , "union offer?" , "Suggestion put forward for consideration" , "Offer - suggestion" .)