Related Clues:
- A GP might have nothing in him
- Longtime mall chain
- 36-Across opening
- Space between peaks
- Trendy clothing giant
- See 15
- Long narrow cut
- Long straight cut
- Space (maybe for a year?)
- Generation separator
- Reason for braces, perhaps
- Space between teeth, e.g
- Vacancy
- Hole in one's knowledge
- Spark-plug specification