Wondrous event (7)
I believe the answer is:
miracle
'wondrous event' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for miracle that I've seen before include "Supernatural happening" , "Amazing or unexplained occurrence" , "Welcome event that's not explained by natural law" , "Unexplained wonder" , "Extraordinary event" .)