Related topics: Power
1TP British English
clockwork toys, trains, soldiers etc have machinery inside them that makes them move when you turn a key:
mechanical toys powered by clockwork
The tape was driven by a clockwork motor.
to happen in exactly the way you had planned:
The concert went like clockwork.
happening at the same time and in the same way every time:
Matt came round each Friday, regular as clockwork.
in an extremely exact way