Related Clues:

• Only fishy, and that's flat!
• There's only this and that's flat
• is 27 across the only one to have one?
• Onl;y one, and that's flat
• Not the only thing to be found in the sea
• That's the only thing that's underfoot, and that's flat
• That's the only thing that's under one foot
• It's underfoot, and that's flat
• It's very fishy it being by itself, and that's flat
• Not in 1 down, and that's flat
• Only flat underfoot
• It's flat underfoot, flat in the water
• Basketball-shoe part
• Fillet fish
• ''Dover'' delicacy