Related Clues:

• Walk on
• Singular food fish
• The only fish?
• No choice fish!
• The Italian sun-fish
• Rated (anag.)
• Only person to be heard
• Only a fish
• Unique fish
• 1 across only, perhaps, on foot
• Fish that's very nearly extinct?
• Single and a good catch
• Dover - -
• Only part of the golf club
• Only it is trodden underfoot