Crossword Genius

Energetic agent frames right and left (9)

Ross

I believe the answer is:

sprightly

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'energetic' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for sprightly that I've seen before include "Lively" , "Moving nimbly" , "Brisk" , "Active" , "Vivacious" .)

I've seen this clue in the Sydney Morning Herald.
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