| INTERACT | Train, etc, to work on each other (8) |
| LUNCHBOX | Container for transporting sandwiches etc to work or school (8) |
| ABUTMENT | A pier or other support for an arch or a vault; or, the point at which two things border or lean on each other (8) |
| REACTION | A chemical process in which substances act mutually on each other (8) |
| TENPACES | 'Twas to a lesser extent old duellists went before turning on each other! (3,5) |
| TRADEWAR | An economic conflict where countries impose tariffs etc. on each other (5,3) |
| SPOTTERS | Hobbyists who observe birds, trains etc, or books used to identify the latter; A&R scouts; or, supervisors of weightlifters or gymnasts (8) |
| VEHICLES | Cars, trains, etc (8) |
| AFTEREFFECTS | The consequences free staff etc. to work (12) |
| ESPIED | Noticed what is key to what Russians and Americans did on each other during cold war (6) |
| TWOTIMERS | Sure, doesn't it take a couple to cheat on each other..? (3-6) |
| FARE | The price a passenger has to pay to take a bus, train, etc. |
| PASSENGER | One travelling in a boat, bus, car, plane, taxi, train etc, other than the crew, driver or pilot; or, a hanger-on, carried along by others' efforts (9) |
| INTERDEPENDENT | RELYING ON EACH OTHER (14) |
| NOMANISANISLAND | Is tax haven landlocked? We depend on each other |
| CHAIN | Series of things linked together as if depending on each other (5) |
| ABOARD | On a ship, train etc (6) |
| BOARDS | Gets on ship, train etc (6) |
| TWIT | Mr and Mrs -; Roald Dahl's husband and wife characters who play a series of revolting tricks on each other (4) |
| TWITS | The ___ Roald Dahl's children's book written in 1979 about a mean couple who play pranks on each other |
