Lover boy turned on as sparkling wine goes round (8)
I believe the answer is:
casanova
'lover' is the definition.
(I've seen this in another clue)
'turned on as sparkling wine goes round' is the wordplay.
'turned' is a reversal indicator.
'sparkling wine' becomes 'cava' (Spanish sparkling wine).
'goes round' is an insertion indicator.
'on'+'as'='onas'
'onas' backwards 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" .)