Crossword puzzle clue "energetic individuals"

DYNAMO, a machine for generating electric currents by means of the relative movement of conductors and magnets

ACE, to serve an unreturnable shot e.g. in tennis

ADEPT, an expert

ASSESSOR, one who assesses

AURA, (Latin) a subtle emanation

BEAST, to punish or torture (someone) in a manner that involves excessive physical exercise

(French) a combination of parties, nations or other units to achieve a common purpose