Dismiss old Spanish dry wine (4)
I believe the answer is:
sack
This might be a double definition.
'dismiss' is the first definition.
(I know that dismiss can be written as sack)
'old spanish dry wine' is the second definition.
'sack' can be an answer for 'wine' (sack is a kind of wine). I'm not certain of the 'old spanish dry' bit.
Can you help me to learn more?
(Other definitions for sack that I've seen before include "Large bag; dismiss" , "Large canvas bag" , "A bag for Falstaff's drink" , "It carries coal" , "Dismissal - sherry!" .)