Very dry variety of sherry (4)
I believe the answer is:
fino
'sherry' is the definition.
(I've seen this before)
'very dry variety of' is the wordplay.
'very dry variety' becomes 'fin' (I can't explain this - if you can you should believe this answer much more).
'of' becomes 'o''.
'fin'+'o'='FINO'
Can you help me to learn more?
(Other definitions for fino that I've seen before include "Type of sherry" , "Bone dry sherry, served chilled" , "Driest of the sherries" , "Light dry sherry" , "Dry Spanish sherry" .)