Fantastic eastern wit, a discriminating drinker (4,6)
I believe the answer is:
wine taster
'a discriminating drinker' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'fantastic eastern wit' is the wordplay.
'fantastic' indicates an anagram.
'eastern'+'wit'='easternwit'
'easternwit' is an anagram of 'WINE TASTER'.
Can you help me to learn more?
(Other definitions for wine taster that I've seen before include "Person with refined palate" , "Drinks sampler" , "Person presented bouquets, perhaps" , "judge turning to drink" .)