He had to get killed, travelling back in time (5)

I believe the answer is:

epoch

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'time' is the definition.
(epoch is a kind of time)

I don't understand how the rest of the clue works.

(Other definitions for epoch that I've seen before include "Period of notable events" , "Period of time in history" , "Particular historic time period" , "Aeon" , "Unit of geological time" .)

I've seen this clue in The Hindu.

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