Prior to (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
before
'prior to' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for before that I've seen before include "Prior to" , "Defy, withstand" , "In advance" , "In sight of" , "In front of (something)" .)