Possible Clues:

• From 10 across comes what's crude on land
• Where sailors take liberties
• Beached
• It's had a 32 down and is quite unrefined, but not for 19 across
• A soft mineral on the beach
• Breaking a horse? Not in the main
• So a her is never all at sea
• It's burnt and crude and not on board
• It's burnt, crude and not all at sea
• On to land, from the sea