The other king backed king of Persia (6) = XERXES
the other = SEX, king = REX, backed = reverse
Husband’s past skill in an ACV (10) = HOVERCRAFT
husband = H, past = OVER, skill = CRAFT
Shaw’s Captain has money tied up (10) = BRASSBOUND
money = BRASS, tied up = BOUND, from Captain Brassbound’s Conversion by George Bernard Shaw.
ACV = HOVERCRAFT (Air Cushioned vehicle)