Dynamic, energetic (6)
I believe the answer is:
active
I believe this clue is a double definition.
'dynamic' is the first definition.
(similar in meaning)
'energetic' is the second definition.
(associated in meaning)
(Other definitions for active that I've seen before include "(Of mind) alert, lively" , "In actual operation" , "Involved with sports" , "Not passive" , "Lively, working away" .)