South American rejected sham version of this liqueur (9)
I believe the answer is:
cointreau
'this liqueur' is the definition.
(I've seen this before)
'south american rejected sham version' is the wordplay.
'rejected' suggests deleting specific letters.
'version' is an anagram indicator.
'south'+'american'='southamerican'
'southamerican' with 'sham' taken away is 'outerican'.
'outerican' anagrammed gives 'COINTREAU'.
'of' acts as a link.
(Other definitions for cointreau that I've seen before include "A sweet orange-flavoured liqueur for cautioner" , "Orange liqueur" , "Sweet orange-flavoured colourless liqueur" , "Alcoholic drink" .)