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Language from Jack makes the Conservative leader drop the sparkling wine (4)

Ross

I believe the answer is:

java

I'm a little stuck... Click here to teach me more about this clue!

'language' is the definition.
(major programming language)

'jack makes the conservative leader drop the sparkling wine' is the wordplay.
I cannot really understand how this works, but
'jack' could be 'j' (playing card abbreviation) and 'j' is found within the answer.
The remaining letters 'ava' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'from' acts as a link.

Can you help me to learn more?

(Other definitions for java that I've seen before include "Indonesian island - computer programming language" , "Large island; coffee type" , "Coffee - computer programming language" , "Its capital is Jakarta" , "Catlike" .)

I've seen this clue in The Hindu.
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