A new compiler mostly imbibing single liqueur (8)
I believe the answer is:
anisette
'liqueur' is the definition.
(I know that anisette is a type of liqueur)
'a new compiler mostly imbibing single' is the wordplay.
'new' becomes 'n' (abbreviation as in New Testament NT).
'compiler mostly' becomes 'sette' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'imbibing' is an insertion indicator (drinking in).
'single' becomes 'I' (one).
'n'+'sette'='nsette'
'nsette' placed around 'i' is 'nisette'.
'a'+'nisette'='ANISETTE'
Can you help me to learn more?
(Other definitions for anisette that I've seen before include "Strong-flavoured liqueur" , "Herb-flavoured liqueur" , "Liqueur flavoured with seeds" , "Aromatic cordial drink" , "Liquorice flavoured liqueur" .)