Highly motivated (6)
'highly motivated' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for driven that I've seen before include "Highly motivated (informal)" , "Strongly motivated to succeed" , "Given a lift" , "Forced, compelled" , "Urged or forced along" .)
(Other definitions for psyched that I've seen before include "frightened" , "Prepared" .)