Active, full of energy (7)
I believe the answer is:
dynamic
I believe this is a double definition.
'active' is the first definition.
(similar in meaning)
'full of energy' is the second definition.
(I've seen this before)
(Other definitions for dynamic that I've seen before include "I'm Candy (anag) - full of beans" , "Full of energy and ideas" , "Driving" , "Constantly changing" , "Powerful and vigorous" .)