Possible Clues:

• It's so hard that there's nothing heavenly under the ocean
• Carapace found on the beach
• Vast expanse's a miserable place for hermitÕs abode
• A hard case in the main
• It's hard to find the ocean that's not heavenly
• The ocean is certainly not heavenly and it is hard
• Market to be entered by former tennis star, one that's washed up?
• One thing she has for sale on beach? It's hard to say
• Notice lines filled with residue in scallop?
• He sells a mobile home by the coast, perhaps