| CHUFF | Sound like a steam-engine to make one happy? (5) |
| TENDER | A railway wagon attached to a steam-engine to carry fuel and water |
| GRAMPUS | Dolphin that sounds like a steam engine (7) |
| GLADDEN | Dangled about to make one happy (7) |
| INBED | Less resting like this could make one happy |
| TUNED | Adjusted a musical instrument to some standard pitch, tone or mood / brought the engine to a proper condition |
| TUNES | Melodies / harmonizes / brings an engine to a proper condition |
| MOTOR | Engine to start turning in the back room (5) |
| GIVEN | Passed drink round, one happy day (5) |
| STALL | You don't want your engine to do it |
| ARUBA | Caribbean locale with the slogan "One Happy Island" |
| ELATED | A note left breaking a date can make one happy! (6) |
| EMULATE | To match up could make one happy, taking in a Greek character (7) |
| ASYOULIKEIT | Play in a forest in a way that makes one happy (2,3,4,2) |
| CAREFREE | Provision for the infirm at no cost? That could make one happy-go-lucky (8) |
| FORTUNATE | Catching fish is what one's good at? It makes one happy (9) |
| PLEASES | Getting a contract in addition makes one happy (7) |
| DELIGHTS | Leaves one in the dark if it makes one happy (8) |
| RELEASE | An album, film, news item, song etc made available to the public; a setting free; a control mechanism on a camera's shutter; or, the opening of a steam engine's exhaust valve (7) |
| GLADIOLUS | Flower that makes one happy when it's cut (9) |
