| HORSEPOWER | Strength of an engine (10) |
| CRANKSHAFT | Many marshals handle part of an engine (10) |
| ALTERNATOR | Later on, art morphed into a bit of an engine (10) |
| EXHAUSTIVE | Part of an engine releasing gases I have can be draining |
| AMPERAGE | Strength of an electrical current |
| STRATONIC | Brought back discipline, increasing strength of an army |
| SEAPOWER | Nautical strength of an AB? (3,5) |
| SAPPER | One who drains the strength of an army engineer maybe |
| MAGICEYE | Device used to indicate the strength of an electrical signal (5,3) |
| ROBUST | Word for bold, hardy, healthy, strong in constitution, sturdy or vigorous, like the enduring strength of an ancient oak, thus its etymological root (6) |
| AMPERAGES | The strengths of an electric current (9) |
| CHUG | An imitative word for one of a series of dull or muffled explosive sounds of an engine; a large gulp of a drink; or, the noise subsequently made (4) |
| DUTY | An obligation; a measure of an engine's efficiency; playground supervision; or, a quantity of water needed to irrigate an area of crops (4) |
| IDLED | (Of an engine) ran out of gear |
| FOLLOWER | An admirer of an engine part (8) |
| BIGEND | Dope put in offer for part of a part of an engine! (3,3) |
| GLIDER | An aircraft able to fly in air currents without the use of an engine |
| BRAKEHORSEPOWER | Imperial unit expressing the force available at the shaft of an engine (5,10) |
| GASKET | Layer of packing material sealing the pistons of an engine (6) |
| ROTOR | Palindromic part of an engine |
