Visa for cavorting pop stars (8)
I believe the answer is:
passport
'visa' is the definition.
(thesaurus)
'cavorting pop stars' is the wordplay.
'cavorting' indicates anagramming the letters.
'pop'+'stars'='popstars'
'popstars' anagrammed gives 'PASSPORT'.
'for' is the link.
(Other definitions for passport that I've seen before include "It could be important on holiday" , "is the open sesame" , "Travel authorisation" , "Document facilitating travel" , "International identification document" .)