| BATTERINGRAM | A large beam used to break down the walls or doors of fortifications (9,3) |
| IMMUNESYSTEM | Company-free community seems to break down the corporate defence (6,6) |
| SUMMER | A time of blossoming or happiness; a poetic word for a year; one of the four seasons; or, from the Old French meaning "packhorse", a large beam or lintel (6) |
| PETARD | Explosive device used to breach walls or doors (6) |
| REGURGITATES | A housefly ___ digestive juices onto solid foods and these juices then break down the food into small pieces which the fly can then drink |
| TRICKORTREAT | Phrase used by children who knock on the doors of houses at Halloween (5,2,5) |
| FOLDINGMONEY | Closing the doors of a financial magazine? |
| JOIST | A beam used to support part of the structure of a building (5) |
| ALIBABA | Poor woodcutter in the Arabian Nights entertainments who discovers that the magic words 'open sesame' will open the doors of a cave containing the treasure of the Forty Thieves |
| RAKE | Long-handled garden tool used to break down soil into a finer tilth (4) |
| TACTICUS | During the 4th century BCE, he wrote On the Defense of Fortifications, one chapter of which was devoted to cryptography, making it the earliest treatise on the subject. |
| ENGINEER | Originally a builder of fortifications, siege artillery and mechanical weapons such as trebuchets, later a designer/maker of machinery or structures such as bridges or roads (8) |
| BRONZE | An alloy of copper and tin used by Lorenzo Ghiberti to make the doors of the Florence Baptistery and also by Andrea del Verrocchio and Donatello in notable equestrian sculptures (6) |
| ACETONE | Colourless solvent used to break down other substances (7) |
| BAIZE | Word that derives from French for "chestnut-coloured" or "reddishbrown", yet is used to describe "virid" felt-like cloth traditionally used for aprons, billiard/card-tables or doors (5) |
| SLEEPER | Horizontal beam used to support part of a railway track (7) |
| GIRDER | Large beam of wood or metal used in building (6) |
| MAGINOT | - - - line, a line of fortifications built by France to defend its border with Germany prior to the Second World War (7) |
| GREATWALL | Series of fortifications in China, along part of which one of the world's most challenging marathons |
| ROYALENGINEERS | Branch of the British Army that undertakes the building of fortifications, mines, bridges, etc |
