Active agent embracing both sides (9)
I believe the answer is:
sprightly
'active' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for sprightly that I've seen before include "Vivacious" , "Active" , "Agile" , "Moving nimbly" , "Lively" .)