All but finished but there are 3 interlinking clues which are driving me nuts - 19 across (6) warships near Madagascan Harbour ???A??: 16down (9) Able to work power shower S???N?M?N and 20 down (7) Books showing where drowned sailor capsized. I can really only get Strongman for 16 down which would make Armada logical for 19 across and 16 down would then be ABL (for sailor) but none of these permutations either fit or parse - could somebody please assist?