In speech went for ancient Briton (4)

I believe the answer is:

pict

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'ancient briton' is the definition.
(ancient people in Scotland during Roman times)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pict that I've seen before include "Early Scot" , "Literary term for painted woman" , "Ancient Scot in Roman times" , "Very old person" , "Old Scot" .)

I've seen this clue in The Sun.

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