Old Testament character, New Testament incident (5)

I believe the answer is:

event

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'incident' is the definition.
(an incident is an event or happening)

'old testament character new testament' is the wordplay.
'old testament character' becomes 'eve' (I am not sure about this - if you are sure you should believe this answer much more).
'new testament' becomes 'nt'.
'eve'+'nt'='EVENT'

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(Other definitions for event that I've seen before include "Affair" , "A thing taking place" , "Episode" , "long jump, say" , "major incident" .)

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