Proposed to the future wife (8)
I believe the answer is:
intended
'proposed' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for intended that I've seen before include "Fianc(e) - proposed" , "Had in mind to" , "no mistake!" , "The boyfriend" , "Planned, meant to" .)