Prospective husband (6)
(Other definitions for fiance that I've seen before include "One waiting to go to match" , "Groom-to-be" , "One promised in marriage" , "One who's engaged" , "He's engaged to be married" .)
(Other definitions for suitor that I've seen before include ". . . he woos his girl" , "Prospective husband" , "One seeking marriage" , "Man pursuing a woman for marriage" , "He woos a maid" .)