Fourth word in the "Star Wars" prologue (3)
I believe the answer is:
ago
'fourth word in the star wars prologue' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ago that I've seen before include "(Years) before the present time" , "Time past" , "In past times" , "Gone, past, since" , "Previously" .)