Crossword Genius

Getting new van, even he is then extremely happy (2,7,6)

Ross

I believe the answer is:

in seventh heaven

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'happy' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for in seventh heaven that I've seen before include "Rapturous" , "Jubilant" .)

I've seen this clue in The Daily Express.
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