Nowadays wine is short, used for a special purpose (2,3)
I believe the answer is:
ad hoc
'for a special purpose' is the definition.
(I've seen this before)
'nowadays wine is short' is the wordplay.
'nowadays' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'wine' becomes 'hock' (hock is a kind of wine).
'is short' means to remove the last letter.
'hock' with its final letter removed is 'hoc'.
'ad'+'hoc'='AD HOC'
'used' acts as a link.
(Other definitions for ad hoc that I've seen before include "For this special purpose (Latin)" , "Intended for one specific matter" , "as required" , "special operation" , "particular case" .)