Language from Jack makes the Conservative leader drop the sparkling wine (4)
I believe the answer is:
java
'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" .)