Wild creature's roar and energy (5)
I believe the answer is:
dingo
'wild creature's' is the definition.
(I've seen this before)
'roar and energy' is the wordplay.
'roar' becomes 'din' (I've seen this in another clue).
'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 dog of Australia" , "Kipling's yellow dog" , "Wild Australian dog" , "Wild creature" , "Wild animal" .)