| MILLIONS | Numerous passengers doing this round Waterloo underground in 1967 (8,2,6,8,4,5) |
| SWARMING | Numerous passengers doing this round Waterloo underground in 1967 (8,2,6,8,4,5) (see 1D) |
| LIKEFLIES | Numerous passengers doing this round Waterloo underground in 1967 (8,2,6,8,4,5) (see 1D) |
| OFPEOPLE | Numerous passengers doing this round Waterloo underground in 1967 (8,2,6,8,4,5) (see 1D) |
| NICO | Collaborator with The Velvet Underground in 1967; coin (anag.) (4) |
| TRENDY | It's an effort to go round Waterloo with it (6) |
| MOLERAT | Defector in pursuit of spy, one going underground in Africa |
| CHILEAN | Like the Copiapo mine, in which 33 miners were trapped underground in 2010 |
| OBESE | Honours even at first in this round |
| DRINKSAREONME | "I've got this round!" ... or a literal hint to this puzzle's theme |
| SALVO | South Africa is ahead 55-0 in this round (5) |
| BEAT | In this round, you get the better of (4) |
| OTTERS | Resting underground in a holt or above ground in a couch/hover, an animal with a waterproof chocolate brown coat, a footprint known as a seal and a tail known as a rudder (6) |
| ELAS | Greek underground in W.W. II |
| STALAGMITE | Pillar of the underground in prison having served time (10) |
| DEWSBURY | Drops put underground in the West Riding (8) |
| METRO | The underground, in Paris, gives me a bit of trouble |
| BURY | Install underground in northern town (4) |
| TENUOUS | Weak start for Underground in redesign of Euston |
| BEND | Both end with Underground in Barking (5,3,4) |
