Possible Clues:

• Flat-fish
• A fish; light touch
• It's no good up there, and that's flat
• Apply small amounts (usually a liquid) to a surface
• A bad, backward fish
• Bad sort of fish?
• Small fish being bad
• The fish may turn stinking, and that's flat!
• It's no good coming back with this, and that's flat
• Bad kind of fish