Exotic island bordering Guam distributed potpourri (10)
I believe the answer is:
salmagundi
'potpourri' is the definition.
(thesaurus)
'exotic island bordering guam distributed' is the wordplay.
'exotic' is an anagram indicator.
'bordering' is an insertion indicator.
'distributed' indicates an anagram.
'island' with letters rearranged gives 'salndi'.
'guam' anagrammed gives 'magu'.
'salndi' enclosing 'magu' is 'SALMAGUNDI'.
(Other definitions for salmagundi that I've seen before include "Hotchpotch" , "medley" .)