What happened repeatedly in 1770 (5)

I believe the answer is:

event

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'what happened' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

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(Other definitions for event that I've seen before include "case" , "heat, perhaps" , "Something going on" , "Result; incident" , "High jump, say" .)

I've seen this clue in The Times.

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