clockwork
/ˈklɑːkˌwɚk/
noun
Britannica Dictionary definition of CLOCKWORK
[noncount]
1
:
the system of moving wheels inside something (such as a clock or an old-fashioned toy) that makes its parts move
2
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used to describe something that happens or works in a very regular and exact way
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Every morning, like clockwork, customers line up outside the front door of the bakery.
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Their wedding went (off) like clockwork. [=their wedding went very smoothly; everything in the wedding happened the way they planned]
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The birds return each year, (as) regular as clockwork.
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often used before another noun