| CRUSHER | Machine designed to reduce rocks to gravel (7) |
| NANOBOT | A microscopic machine designed to carry out specific tasks (7) |
| NONSLIP | Designed to reduce sliding |
| NONSKID | Skin Don removed, it is designed to reduce slipping (3-4) |
| SCREECH | What brakes may do, delivering loose rocks to church (7) |
| THEOREM | Rule requiring rock to be stored in the mine's entrance (7) |
| SHEARPIN | Safety device in machine designed to break |
| ORNITHOPTER | A machine designed to achieve flight by means of flapping wings |
| ENGINE | Machine designed to convert energy into mechanical work (6) |
| PLOW | Farm machine designed to break up the soil |
| STUFFIN | Do wrong, grabbing rock, to fill very full |
| ICECUBE | Frozen rock to cool down your drink (3,4) |
| SHREDDER | Take off last wrapper inside for German machine designed to destroy the written word perhaps (8) |
| BOULDERCLAY | Unstratified soil deposited by a glacier, comprising many particles, from sand (and smaller) to gravel and rocks, mixed together (7,4) |
| GRIT | Old king to object to gravel (4) |
| DOUBLEGLAZING | Window type with two layers of glass, designed to reduce loss of heat and to exclude noise (6,7) |
| PEA | Lead-in to "gravel" or "green" |
| TAR | Alternative to gravel, perhaps |
| AERO | Designed to reduce wind resistance |
| EYESHADE | See heady mixture designed to reduce effect of light |
