Noise and energy: wild animal! (5)
I believe the answer is:
dingo
'wild animal' is the definition.
(I've seen this before)
'noise and energy' is the wordplay.
'noise' becomes 'din' (din can mean a loud noise or disturbance).
'and' is a charade indicator (letters next to each other).
'energy' becomes 'go' (go can mean energy or enthusiasm).
'din'+'go'='DINGO'
(Other definitions for dingo that I've seen before include "Wild creature" , "dog running wild" , "Aus. wild dog" , "Want a dog" , "Kipling's "Yellow-Dog"" .)