4 down
Name
top
class
capital
(5)
Name top class capital (5)
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The definition is at the end of the clue.
How the clue works
Right, so capital at the end is your definition — Dubai being a major city and all that. For the wordplay, take DUB (meaning to name someone or something) and stick AI on the end, which is "top class" written out as A1 — bung them together and you're at DUBAI.