River of wine (hock, etc.) (5)

I believe the answer is:

rhine

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'river' is the definition.
(Rhine is an example)

I cannot understand how the remainder of the clue works.

(Other definitions for rhine that I've seen before include "Ring river (Wagner)" , "Bonn's river" , "River, rising in Switzerland and flowing into the North Sea" , "Great river that flows through Germany" , "Flower" .)

I've seen this clue in the Evening Standard.

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