Struggling with the last 4 - please can you help
Answers are related to the sea in some way
6. Water at one end of the magnet (5 3) (something sea)
7. I can twist cap of ice here (7 5)
8. Nothing escapes when I join cocoa substitute by the water (9 3) (Caribbean Sea?)
28. Where Troy Tempest gets to stab singer Charles (8)
69. Ka goes round north to loiter with fuel (3 6)