8 across
Jack
built
new
houses:
a
number
on
top
of
the
world
(8)
Jack built new houses: a number on top of the world (8)
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The definition is at the end of the clue.
How the clue works
The answer means on top of the world, as in feeling jubilant. Start with J for Jack (the card), then take an anagram of "built" (signalled by "new") which houses A plus N for number, giving UBIL wrapped around AN and finishing with T. Put it all together and you get JUBILANT.