European people, very smart, though changing at the end (5)

I believe the answer is:

swiss

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'european' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for swiss that I've seen before include "Native to Berne" , "Mid-European" , "Nationality of Carl Jung" , "Like Gruyere, Emmental" , "William Tell's nationality" .)

I've seen this clue in The Independent.

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