Reticent about sin creating alcoholic drink (6)
I believe the answer is:
sherry
'alcoholic drink' is the definition.
(I've seen this before)
'reticent about sin' is the wordplay.
'reticent' becomes 'shy' (both can mean withdrawn or timid).
'about' is an insertion indicator.
'sin' becomes 'err' (to sin is to err morally).
'shy' going around 'err' is 'SHERRY'.
'creating' acts as a link.
(Other definitions for sherry that I've seen before include "Spanish fortified wine" , "Spanish drink" , "Jerez tipple" , "Strong sweet wine as aperitif" , "Wine from Spain's Jerez region, drunk as an aperitif" .)