Offer of marriage (8)
I believe the answer is:
proposal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">offer of marriage</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for proposal that I've seen before include "Plan, suggestion" , "Offer, of marriage say" , "Offer - suggestion" , "a match might be arranged?" , "Suggestion put forward for consideration" .)