Wine store in future undergoing merger? (9)
I believe the answer is:
combining
'merger?' is the definition.
(merger is a kind of combining)
'wine store in future' is the wordplay.
'wine store' becomes 'bin' (stand for storing wine bottles).
'in' is an insertion indicator.
'future' becomes 'coming' (similar in meaning).
'bin' inserted into 'coming' is 'COMBINING'.
'undergoing' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Another definition for combining that I've seen is " Putting together to form a whole".)