Related Clues:
- Not just primary, as an heir
- River swimmer
- Flatfish; exclusive
- Only music genre listened to?
- Fish; part of the foot
- What's underfoot?
- Source of a footprint
- Fish that may be served meunière
- Fish with prized roe
- Fish in the herring family
- Unique flatfish
- Flat part of a flat
- Shoe part that's usually the first to wear out
- Fish that migrates up streams to spawn
- Shoe part that might be replaced