| ERYMANTHIANBOAR | Large, wild beast in Arcadia, captured and destroyed by Hercules as the fourth of his labours (11,4) |
| AUGEAS | Mythological Greek king whose stables were cleaned by Hercules as the fifth of his 12 labours (6) |
| EPIGONI | In Greek mythology, the descendants of the Seven against Thebes, who undertook a second expedition against the city and eventually captured and destroyed it |
| TITUS | Roman emperor who captured and destroyed Jerusalem (5) |
| TASMANIANDEVILS | Wild beasts in land I've associated with Satanism, wrongly |
| HYDRA | Many-headed monster slain by Heracles (Hercules) as the second of his Twelve Labours (5) |
| TRIOLET | Eight-line poem in which the first line repeats as the fourth and seventh and the second line repeats as the eighth (7) |
| POUSSIN | French classical artist who painted A Dance to the Music of Time, the Venetian-inspired The Nurture of Bacchus, the pastoral Et in Arcadia ego and The Four Seasons series (7) |
| NEMEANLION | Creature slain by Hercules in the first of his labours (6,4) |
| PLASMA | Hot ionized material of which all stars are composed, made up of roughly equal numbers of positive ions and free electrons; sometimes regarded as the fourth state of matter (6) |
| MACCHUPICCHU | Spanish forces overran and destroyed this terraced settlement perched high on a mountainside above the Urumbamba Valley in Peru, part of the Inca empire in the mid-16th century. In 1911, Hiram Bingham |
| NUMBERS | Fourth book of the Old Testament, also known as the fourth book of Moses (7) |
| HERCULES | He's admitted cruel manipulation in the course of his labours... (8) |
| CHICAGOBULLS | Basketball team based in Illinois ranked by Forbes as the fourth most valuable NBA team in 2018 with a valuation of $2.6 billion: 2 wds. |
| BAKER | Actor who starred as the fourth incarnation of the Doctor and later narrated Little Britain (5) |
| RUBY | What type of chocolate, introduced in 2017, is marketed as the 'fourth' variety after milk, dark and white? (4) |
| ANNEOFCLEVES | Queen of England as the fourth wife of Henry VIII, born in Dusseldorf (4,2,6) |
| ANNE | --- of Cleves, Queen of England as the fourth wife of Henry VIII (4) |
| SLAB | Large chunk of his labours (4) |
| HEAT | Geothermal energy is a form of energy conversion in which ____ energy from within the Earth is captured and harnessed for the use of humans (4) |
