Will you marry me and stay, Old Sal? (8)
I believe the answer is:
proposal
'will' is the definition.
(thesaurus)
'stay old sal?' is the wordplay.
'stay' becomes 'prop' (I've seen this in another clue).
'old' becomes 'o' (abbreviation).
'prop'+'o'+'sal'='PROPOSAL'
'you marry me and' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for proposal that I've seen before include "Offer - suggestion" , "Suggestion put forward for consideration" , "Plan, suggestion" , "Offer, of marriage say" , "put before the union?" .)