Related Clues:

• Kind of fish - lose it
• A lone sort of fish - lose it
• A lonely sort of flatfish
• You've only got to see 36 across for this.
• 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