| SMOKE | A by-product of a bonfire or candle that is also the vapour used in apiculture to calm honey bees (5) |
| ROMAN | Type of nose or candle that can have holiday (5) |
| SMOKER | A curer of bacon, cheese, duck or salmon; a user of tobacco; a train carriage or men-only gathering for inhaling or puffing said leaf; a vent in the ocean's floor; or, in apiculture, a beekeeper's pip |
| SCOUT | In apiculture and melittology, a worker honeybee responsible for finding a site for a swarm to settle (5) |
| GOOSEFAT | By-product of a classic Christmas entree |
| SPINOFF | By-product of a larger project (4-3) |
| TEARGAS | Vapour used in warfare (4,3) |
| MUSTARDGAS | Vapour used in chemical warfare, causing blindness and burns (7,3) |
| AIRBUBBLES | By-products of a poorly applied screen protector |
| TREACLE | A by-product of sugar refining; according to an old music-hall joke, it was mined in Lancashire, notably in Sabden, where the story was encouraged by fictitious reports in local newspapers in the 1930 |
| TAPER | Anglo-Saxon word for any wax candle that came to mean a long thin waxed wick or spill for transferring a flame; a gradual narrowing or reduction; or, a dim or feeble light (5) |
| FUDGE | From "to merge", word meaning "cobble together", "manipulate facts or figures" or "humbug!" that is also the name of a soft sweet, based on a mixture of butter, cream and sugar (5) |
| SPLINT | Fragment of diamond; another word for a spill for transferring a flame to fireplace or candle; or, a flexible lath used in basketry (6) |
| EDELWEISS | Alpine flower that is also the title of a song in the film musical The Sound of Music (9) |
| TICKET | Derived from a French word that is also the source of "etiquette", a card or slip, such as a travel pass (6) |
| ARSENIC | A toxic metalloid element; a by-product of the smelting of copper, lead, cobalt and gold ores (7) |
| COALTAR | A by-product of gas production, preparations of what have long been used to treat skin conditions, such as eczema, psoriasis and dandruff? (4,3) |
| STEAM | Vapour used to power the Mallard, Stephenson's Rocket, the Orient Express or the Flying Scotsman (5) |
| ENIGMA | Word for a mysterious or puzzling person or thing that is also the code deciphered at Bletchley Park during the Second World War (6) |
| FOXTROT | Sixth letter of the NATO phonetic alphabet that is also the name of a ballroom dance (7) |
