Topless operatic hero in swinging party? (4)
I believe the answer is:
orgy
'party?' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for orgy that I've seen before include "wild spree" , "Excessive indulgence" , "Wild self-indulgent party" , "overindulgence" , "Excess" .)