It happened in Seventies (5)

I believe the answer is:

event

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'it happened' is the definition.
The definition suggests a singular noun which matches the answer.

'in seventies' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EVENT' is hidden within 'seventies'.

Can you help me to learn more?

(Other definitions for event that I've seen before include "Something taking place" , "Occurence, happening" , "400 metres?" , "tournament" , "long jump, say" .)

I've seen this clue in The Mirror.

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