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 backwards.
'sparkling wine' becomes 'cava' (Spanish sparkling wine).
'goes round' indicates putting letters inside.
'on'+'as'='onas'
'onas' written backwards gives 'sano'.
'sano' going into 'cava' is 'CASANOVA'.
'boy' is the link.
(Other definitions for casanova that I've seen before include "18th century Italian lover" , "Predatory male" , "Giacomo" , "Rake" , "Notorious seducer" .)