Related Clues:
- Knockout gas
- Early surgery aid
- Standard anesthetic, once
- Light liquid used as anaesthetic
- An early anaesthetic
- Upper air
- The gas is there, oddly
- An early anaesthetic - so there
- Anaesthetic is, strangely, there
- There goes the anaesthetic
- It used to be an anaesthetic
- Formerly an anaesthetic
- With 'er around the middle, that can put you to sleep
- In an easterly direction with a 12 across
- There now, that will put you to sleep