Crossword Genius

Demonstration of cooking meats in red wine (9)

Ross

I believe the answer is:

testament

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'demonstration' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'cooking meats in red wine' is the wordplay.
'cooking' indicates anagramming the letters (cook can mean to falsify or distort).
'in' means one lot of letters goes inside another.
'red wine' becomes 'tent' (type of Spanish wine).
'meats' is an anagram of 'stame'.
'stame' inserted into 'tent' is 'TESTAMENT'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for testament that I've seen before include "(Person's) will" , "Will - part of bible" , "Biblical division" , "New and old parts of the Bible" , "Statement about final intentions" .)

I've seen this clue in The Telegraph.
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