| LAOCOON | Lack of oxygen and fuel upset priest of Apollo |
| SIUDE | Something like Times New Roman fuels upset |
| CALCHAS | He is the son of Thestor (a priest of Apollo) and a famous soothsayer among the Greeks at the time of the Trojan War. In Troilus and Cressida (act 4, scene 5), Troilus says, "My Lord Ulysses, tell me, |
| TIMEZONE | Mountain in America, say, endlessly emits rocks and unknown source of oxygen and neon (4,4) |
| BREATH | Intake of oxygen and expulsion of carbon dioxide during respiration; one such inhalation or exhalation; a sound so produced; or, life itself (6) |
| AIR | It's a mixture mainly of oxygen and nitrogen (3) |
| OXIDE | Compound of oxygen and an element (5) |
| POISONED | Prepared to take delivery of oxygen and nitrogen that's contaminated (8) |
| STOPCOCK | What can cut off supply of oxygen and copper in store (8) |
| CPR | Potential life-saver when 1A 30 is short of oxygen and lacks energy |
| PEROXIDE | What do hairdressers call a certain compound of oxygen and hydrogen? (8) |
| JAMES | Scottish engineer and inventor who patented 'A new method of lessening the consumption of steam and fuel in fireengines' in 1769 (5) |
| WATT | Scottish engineer and inventor who patented 'A new method of lessening the consumption of steam and fuel in fireengines' in 1769 (4) |
| VERTIGO | Heightened pressure upstairs upsets priest going in and out of Tierra del Fuego (7) |
| DOCILE | Under the doctor, upset priest is easily managed (6) |
| TIPSTER | Tout upset priest after Towcester's first (7) |
| ESPRIT | ... first half, perhaps, upset priest (6) |
| SPRITE | Mythical being upset priest (6) |
| HOSTILE | Unfriendly landlord upset priest (7) |
| TERPSICHORE | Inspiring female upset priest's routine |
