Liqueur mixed in tea-set! (8)
I believe the answer is:
anisette
'liqueur' is the definition.
(anisette is a kind of liqueur)
'mixed in tea-set' is the wordplay.
'mixed' indicates an anagram.
'in'+'tea'+'set'='inteaset'
'inteaset' anagrammed gives 'ANISETTE'.
(Other definitions for anisette that I've seen before include "Liqueur with flavour of liquorice" , "Liquorice-flavoured liqueur" , "[APERITIF]" , "Strong-flavoured liqueur" , "Herb-flavoured liqueur" .)