Crossword Genius

A gem of wine (4)

Ross

I believe the answer is:

ruby

This clue is a double definition.

'a gem' is the first definition.
(ruby is a kind of gem)

'wine' is the second definition.
(thesaurus)

'of' acts as a link.

(Other definitions for ruby that I've seen before include "Gemstone - shade of red" , "Girl's name - colour" , "Jack perhaps" , "Precious red gem" , "Deep red variety of corundum" .)

I've seen this clue in The Telegraph.
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