Reminder to stock wine (8)
I believe the answer is:
keepsake
'reminder' is the definition.
(I've seen this before)
'stock wine' is the wordplay.
'stock' becomes 'keep' (I've seen this before).
'wine' becomes 'sake'.
'keep'+'sake'='KEEPSAKE'
'to' acts as a link.
(Other definitions for keepsake that I've seen before include "one recalls" , "It serves to keep a person in mind" , "Something of sentimental value" , "to remember one by" , "Souvenir, memento" .)