Erotic setting for one opposed to jamboree (8)
I believe the answer is:
carnival
'jamboree' is the definition.
(thesaurus)
'erotic setting for one opposed' is the wordplay.
'erotic' becomes 'carnal' (I've seen this before).
'setting for' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'opposed' becomes 'v' (abbreviation for versus).
'i'+'v'='iv'
'carnal' placed around 'iv' is 'CARNIVAL'.
'to' acts as a link.
(Other definitions for carnival that I've seen before include "Notting Hill event" , "Travelling funfair" , "Pre-Lent jollity" , "Fiesta" , "Public celebration with processions, music, etc" .)