Lover boy turned on as sparkling wine goes round (8)
I believe the answer is:
casanova
'lover' is the definition.
(I've seen this before)
'turned on as sparkling wine goes round' is the wordplay.
'turned' says the letters should be written in reverse.
'sparkling wine' becomes 'cava' (Spanish sparkling wine).
'goes round' is an insertion indicator.
'on'+'as'='onas'
'onas' back-to-front is 'sano'.
'sano' placed within 'cava' is 'CASANOVA'.
'boy' acts as a link.
(Other definitions for casanova that I've seen before include "18th century Italian lover" , "Predatory male" , "Giacomo" , "Rake" , "Notorious seducer" .)