Possible Clues:

• What you wouldn't say to a goose about a louse - very fishy!
• Protest about young louse getting fish
• It's a little lousy in what you'd say to a goose, and very fishy, too
• What a big fish wouldn't say to a big goose about a little louse
• Skipjack
• Tuna's cousin
• What one wouldn't say to a goose gets fishy about what's a little lousy
• It's more than a little fishy to think you might get it in in a boot
• Just for 22 across, that's what one might say to a goose about a louse
• Fish with nasty smell? Then there's refusal to eat it