| TESSELLATION | Word, from the Greek for "four", thus the Latin for "cube, die, square", for the act or art of perfectly interlocking, mosaicking or tiling shapes, leaving neither spaces nor gaps (12) |
| TASSERA | From "four", a cube, die or square tablet on which a watchword was written as a token or ticket in classical times; or, a small quadrilateral block/tile for mosaic (7) |
| THRUST | Sea lavender's cousin growing on wind-smitten cliffs, rocks, ocean-sprayed turf and shores; or, from "grasp, prosperity, success", a word for the act or art of frugality, parsimony or prudence (6) |
| ERGO | Thus the Latin. (4) |
| IGNITION | Word for the act or process of lighting a fire or for activating combustion in an IC engine (8) |
| PINE | Egg lass sicks Mell four thus ease in |
| TETRA | Aquarium fish with a name that derives from the Greek for "four-sided wing" |
| TETRIS | Which classic video game takes its name from the Greek for four? (6) |
| TET | Which classic video game takes its name from the Greek for four? (6) |
| EFFOFF | 4 thus gives us our instruction to leave (3,3) |
| CARVING | The act or art of sculpture in ivory, stone, wood etc; the dendroglyph, figure or form created; the process of cutting up roasted meat at a table; or, a technique of turning in skiing (7) |
| DUELLA | The act or art of one-on-one combat; or, the code of rules governing such an affair of honour (6) |
| ENGRAVING | The act or art of incising designs on metal, wood and the like in order to print impressions from them (9) |
| JUGGLERS | The act or art of legerdemain, prestidigitation or performing tricks with props; or, trickery generally (8) |
| SCANSION | The act or art of analysing the metrical patterns of verse (8) |
| REVIVAL | Word for the act of giving someone or something, such as an old play, the kiss of life; quickening from depression or languor; or, religious awakening (7) |
| CHOICE | Word for the act/power of electing, hand-picking, opting or selecting; the thing decided on; or, the best or preferable part, aka the plum (6) |
| SHOOTING | Word for the act of blasting a bore; the sport of hunting game; an estate on which to blast, fire or hunt; or, a sudden twinge of sharp pain (8) |
| CREATION | Word for the act of making; the artefact made; an elaborate or unusual garment, hat etc; or, the cosmos (8) |
| FENESTRA | Latin for "window", hence found in a word for the act of throwing a person out of said light or opening (8) |
