4 Down - One who gets engaged at the same time as a friend (7,2,4)
C???s?e ?n ???s
6 Down - Refuse to vanish over the horizon (7) D???i?e
13 Down - A small measure of moral consideration (7) S?r????
20 Across - He covers a canvas attatchment to the boat (7) ??i?t??
11 Across - Makin' a foundation for this container (5) ?a?i?