Here are the possible solutions for usher in a whole new change history clue
Answer
Clue
Relevancy
era
Clue
Usher in a whole new ___ (change history)
Definition
a main division of geological time
mrright
Clue
You could spend your whole life trying to find him, only to realize he's been right in front of you, making your daily crossword puzzle, the whole time
theone
Clue
Person you could spend your whole life trying to find, only to realize he's been right in front of you, making your daily crossword puzzle, the whole time
reseat
Clue
Usher to a new spot
Definition
to seat again
ufo
Clue
"__ Hunters": History Channel show with the tagline "Hoax or History?"
timewarp
Clue
Sci-fi phenomenon that could change history
adapt
Clue
Change to accommodate change
Definition
to make suitable
euro
Clue
Recent change in change
Definition
(Native Australian) any of several large types of kangaroo, aka wallaroo