The precious metal items in the Snettisham Hoard are believed to have been produced by this ancient tribe (5)

I believe the answer is:

iceni

(Other definitions for iceni that I've seen before include "Rebellious tribe" , "Old people" , "Ancient tribesmen" , "Ancient Brits" , "Boudica's tribe" .)

I've seen this clue in The Times.

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