Crossword Genius

Surprise to get uncapped wine (4)

Ross

I believe the answer is:

hock

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'wine' is the definition.
(type of wine)

I can't explain the rest of the clue.

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(Other definitions for hock that I've seen before include "Buy property, say" , "Animal joint - German white wine" , "German white wine from Rhineland" , "Dry wine; joint; pawn" , "Pawn a German wine?" .)

I've seen this clue in The Independent.
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