Yes, German, Virginia is an island (4)

I believe the answer is:

java

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'an island' is the definition.
(I know that Java is a island)

'yes german virginia' is the wordplay.
'yes german' becomes 'ja' (I am not sure about this - if you are sure you should believe this answer much more).
'virginia' becomes 'va' (US state abbreviation).
'ja'+'va'='JAVA'

'is' is the link.

Can you help me to learn more?

(Other definitions for java that I've seen before include "Jakarta's island" , "Most populous Indonesian island" , "Indonesian island noted for its coffee" , "Large island; coffee type" , "'Indonesian island, famed for coffee (4)'" .)

I've seen this clue in the Sydney Morning Herald.

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