| MOLERAT | Defector in pursuit of spy, one going underground in Africa |
| MOLE | Spy - one going underground (4) |
| TOLERATES | Puts up with the French defector in extremities (9) |
| BECOMFORTED | Mob defector in effort to get consolation (2,9) |
| EARTHWORM | Ticklish case in infectious air? One going underground (9) |
| MOLEDRAINER | Tool to make channel, one going underground - terrible ordeal inside (4,7) |
| TUBER | Root — one going underground? |
| EAVESDROP | Spy, one right out of abandoned Verdi operas (9) |
| AGENT | Spy, one of the old school, manners-wise? (5) |
| BONDIBEACH | Spy one composer taking in English seaside |
| SELFPITY | Spy one felt resorted to maudlin emotion (4-4) |
| ESTATEAGENT | European country spy, one profiting from plots (6,5) |
| PEEPINGTOM | Spy one-time GP playing on piano (7,3) |
| RELAXYOU | Former royal going underground may put one at ease (5,3) |
| CULVERT | Reverse for clergyman in unorthodox religion going underground (7) |
| MINDREADERS | They discern thoughts of fear stopping workers going underground (4,7) |
| STALAGMITE | Pillar of the underground in prison having served time (10) |
| METRO | The underground, in Paris, gives me a bit of trouble |
| TENUOUS | Weak start for Underground in redesign of Euston |
| DAVYLAMP | Safe means of illumination carried underground in the past by miners (4,4) |
