| ENTERING | Going into tunnel or competition (8) |
| ELAN | Dash into tunnel, a new one |
| ADIT | Shaft, access directly into tunnel, first of all |
| ENTRANTS | Those who take part in an event or competition (8) |
| CATACOMB | Underground cemetery, especially one with a series of interconnected tunnels or caves (8) |
| RUNNERUP | A contestant finishing a race or competition in second place (6-2) |
| ENTRYFEE | A charge for admission to an event or competition (5,3) |
| MINE | A colliery, pit, quarry, shaft, tunnel or other excavation from which coal, diamonds, gold, tin or other precious metal or ore is dug; or, by extension, any rich source or abundant supply (4) |
| SAP | Name given to the vital juice of plants; energy or vigour; a fool or gull; or, from "dig a tunnel" or "undermine", a word for "drain, exhaust, weaken" (3) |
| ROOF | Structure created by a thatcher; or, the overhead surface of an arch, cave, excavation, tunnel or vault (4) |
| AIRFLOW | Wind (in tunnel or upper atmosphere) (7) |
| ECHO | Tunnel or cavern effect |
| INCLINE | A sloping tunnel or shaft in mining (7) |
| OPEN | Word describing an unbuttoned coat, an unclosed door or book, land free from trees, an uncrossed cheque or a ticket or competition free from restrictions (4) |
| QUIZ | Word first for an eccentric or odd-looking person or thing, later a test of knowledge for fun or competition (4) |
| ENTRANT | One going in for a race or competition |
| TUBE | One of the tunnels or trains of the London Underground; or, a container for toothpaste (4) |
| WARREN | Word that semantically bunny hopped from "park, preserve" of beasts or fowls to network of rabbit burrows; the conies inhabiting said labyrinthine tunnels; or, any maze of narrow passages/rooms (6) |
| NIPANDTUCK | Close or almost even in a race or competition (3,3,4) |
| CLEANSWEEP | An instance of conceding no goals or points in a match or competition (5,5) |
