Dance supporter coming round with energy (8)
I believe the answer is:
fandango
'dance' is the definition.
(type of dance)
'supporter coming round with energy' is the wordplay.
'supporter' becomes 'fan' (fan is a kind of supporter).
'coming round' means one lot of letters goes inside another.
'with' becomes 'and'.
'energy' becomes 'go' (go can mean energy or enthusiasm).
'fan' going around 'and' is 'fandan'.
'fandan'+'go'='FANDANGO'
(Other definitions for fandango that I've seen before include "Dance performed with castanets" , "Spanish dance -- a dong fan (anag)" , "Old Spanish dance, with castanets" , "Lively Spanish dance" , "Spanish Steps" .)