Last seen in:
- The Times - Concise - Times Concise No 8955
- The Times - Concise - Times Concise No 8268
- The Times - Concise - Times Concise No 8102
- The Guardian - Quick crossword No 15,241 - Mar 14 2019
- The Times - Concise - Times Concise No 7771
- The Washington Post - May 26 2018
- L.A. Times Daily - May 26 2018
- The Telegraph - QUICK CROSSWORD NO: 28,258 - Oct 29 2016
- The Guardian - Quick crossword No 14,236 - Dec 24 2015
- The Times - Concise - Times2 Concise 6591 - December 23, 2014
Related Clues:
- Much-discussed layer
- Lightning byproduct
- Kind of layer protecting the earth
- Layer with a hole in it
- Earth-surrounding layer
- Water sterilizer
- Oxygen variety
- Endangered atmospheric layer
- Ultraviolet-ray blocker
- Ultraviolet light filter
- Rejected scratch 'n' sniff sticker #2
- Oxygen allotrope
- Damaged layer
- Shrinking layer
- Layer to be concerned about