Related Clues:
- Place for hot air to escape
- Put nitrogen in to check gas exhaust
- Express train finally entering test
- Credit after student leaves in depression
- Air conduit
- Result of a meteor strike
- Consider filling about right for dip
- Go on a tweetstorm, say
- Huge hole right behind box
- Hole allowing gas or air to escape
- Deserter hiding in oddly clear hollow
- Give free expression to — opening
- Drop spectacularly
- Opening race perhaps fails to start
- Sign of a big rock hit?