| SEVENAGAINSTTHEBES | The third and only extant play of a trilogy by Aeschylus |
| MENANDER | Comic dramatist of ancient Greece (c. 342-292 BC) whose only complete extant play is Dyskolos (The Grouch or The Curmudgeon) (8) |
| AESCHYLUS | Greek dramatist, regarded as the father of Greek tragedy, whose seven extant plays include the Oresteia trilogy |
| MUTINY | - on the Bounty; novel forming part of a trilogy by Charles Nordhoff and James Norman Hall (6) |
| CAIRO | Setting of a trilogy by Naguib Mahfouz |
| SYBIL | Part of a trilogy by Disraeli (5) |
| ORESTEIA | Play trilogy by Aeschylus, see a riot (anag.) |
| THEORESTEIA | Play trilogy by Aeschylus |
| THEGOODTHEBADANDTHEUGLY | Last of a trilogy of western films in the 1960s, following A Fistful of Dollars and For a Few Dollars More |
| ORESTES | Son of Agamemnon and Clytemnestra, described in a trilogy of Greek tragedies by Aeschylus (7) |
| CICERO | Marcus Tullius -, Roman consul and writer who is the subject of a trilogy of novels by Robert Harris (6) |
| SPIN | A balletic pirouette; a play of a vinyl record; an uncontrolled spiral descent of an aircraft; or, a revolving motion imparted to a cricket ball (4) |
| MAJOR | Of a musical scale, having an interval of a semitone between the third and fourth and the seventh and eighth notes (5) |
| PARTIILAM | End of a trilogy, and a phrase that hints at each circled word when entering it in the Down direction |
| RESPIGHI | Ottorino -; composer of a trilogy of symphonic poems including Pines of Rome (8) |
| INFERNO | First part of a trilogy, followed by Purgatory and Paradise |
| MONOTREME | Egg-laying mammal of the order whose only extant species are the platypus and the echidnas (9) |
| SEACOW | Sirenian mammal, of which the dugongs and manatees are the only extant representatives (3,3) |
| ABSURD | 'Theatre of the -', name given to the plays of a group of dramatists including Beckett and Pinter (6) |
| RAINDOGS | Tom Waits studio album considered the middle album of a trilogy that includes Swordfishtrombones and Franks Wild Years |
