Do wrong to break into reserved wine (6)
I believe the answer is:
sherry
'wine' is the definition.
(sherry is a kind of wine)
'do wrong to break into reserved' is the wordplay.
'do wrong' becomes 'err' (I've seen this before).
'to break into' is an insertion indicator (inserted letters break into the word).
'reserved' becomes 'shy' (I've seen this in another clue).
'err' placed within 'shy' is 'SHERRY'.
(Other definitions for sherry that I've seen before include "Christmas drink?" , "Spanish drink" , "Amontillado, e.g." , "Jerez drink" , "Spanish fortified wine" .)