Related Clues:
- New lock, say - protection for hens due to hatch?
- Egg membrane
- Distended membrane; pouch-like cavity
- Upend barrel and see the last of vinegary bit of egg
- Barrel loony oddly knocked over, where soldiers may go for a dip
- Bag containing yellow sock lay abandoned
- Bodily cavity enclosed by a membrane
- Membranous cavity
- Pouch-like structure
- Something feeding an embryo
- Rejected wine-cask, loyally wrapping small food parcel
- Pouch or bag-like structure
- Bag-like cavity
- Provider of sustenance to an embryo
- In part it's a convenient container for yolk