Enthusiast Angela, not half, in party dance (8)
I believe the answer is:
fandango
'dance' is the definition.
(type of dance)
'enthusiast angela not half in party' is the wordplay.
'enthusiast' becomes 'fan' (fan is a kind of enthusiast).
'not half' indicates taking half.
'in' is an insertion indicator.
'party' becomes 'do' (do is a kind of party).
'angela' halved is 'ang'.
'ang' inserted inside 'do' is 'dango'.
'fan'+'dango'='FANDANGO'
(Other definitions for fandango that I've seen before include "Spanish Steps" , "Lively Spanish dance" , "Old Spanish dance, with castanets" , "Spanish dance -- a dong fan (anag)" , "Old Spanish dance in triple time" .)