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Palatial
European
banks
finished
(6)
Palatial European banks finished (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Palatial — something magnificent or grand. You take SERB (a European), and "banks" tells you to slot UP (finished) inside it, so the outer letters of SERB wrap around UP to give you S-UP-ERB.