Cor! Giesela holds such wild parties! (6)
I believe the answer is:
orgies
'wild parties' is the definition.
(orgy can mean a wild or drunken party)
'cor giesela holds' is the wordplay.
'holds' says the answer is hidden in the clue.
'ORGIES' is hidden within 'cor giesela'.
'such' is the link.
(Other definitions for orgies that I've seen before include "Drunken revels" , "Acts of immoderate indulgence" , "Wild parties with excessive drinking and sexual activity" , "Wild licentious parties" .)