Energetic person giving axe to bouncer (8)
I believe the answer is:
fireball
'energetic person' is the definition.
(synonyms)
'giving axe to bouncer' is the wordplay.
'giving' means one lot of letters go next to another.
'axe' becomes 'fire' (both can mean to dismiss or sack).
'to bouncer' becomes 'ball' (something that bounces).
'fire' put next to 'ball' is 'FIREBALL'.
(Other definitions for fireball that I've seen before include "Incendiary projectile" , "Sphere of flame" , "Spherical incendiary" , "Core of atomic explosion" , "Burning meteor" .)