| Answer | Crossword Clue |
|---|---|
| CAVE | Mountain opening |
| CAVE | Explorable mountain opening |
| APERTURE | Opening |
| AVENUE | Opening. |
| ORIFICE | Opening |
| STARTING | Opening |
| PREAMBLE | Opening |
| APERTURE | Opening. |
| ACCESS | Opening |
| RIFT | Opening |
| INITIAL | Opening |
| SLOT | Opening. |
| PORE | Opening |
| SLIT | Opening. |
| ONSET | Opening |
| GAP | Opening. |
| HOLE | Opening. |
| VENT | Opening |
| DEBUT | Opening |
| PREMIERE | Opening |
| FIRST | Opening |
| HIATUS | Opening. |
| VENT | Opening. |
| HOLE | Opening |
| SPACE | Opening |
| PORT | Opening |
| RENT | Opening |
| ORIFICE | Opening. |
| GENESIS | Opening |
| DOOR | Opening |
| SLIT | Opening |
| OUTLET | Opening. |
| GAP | Opening |
| INTRO | Opening |
| PORE | Opening. |
| LEADIN | Opening |
| START | Opening |
| SLOT | Opening |
| INTRO | Opening words |
| UNI | Cycle opening? |
