White part of horse (4)

I believe the answer is:

hock

I believe this clue is a double definition.

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

'part of horse' is the second definition.
(leg joint in a horse)

(Other definitions for hock that I've seen before include "Animal joint - German white wine" , "White wine and horse's joint" , "White Rhine wine" , "A wine; part of horse's leg" , "Pawn a German wine?" .)

I've seen this clue in The Times.

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