Old Briton selected for hearing (4)
I believe the answer is:
pict
'old briton' is the definition.
(ancient people in Scotland during Roman times)
'selected for hearing' is the wordplay.
'selected' becomes 'picked' (picking is a kind of selecting).
'for hearing' indicates a 'sounds like' (homophone) clue.
'picked' is a homophone of 'PICT'.
(Other definitions for pict that I've seen before include "Literary term for painted woman" , "Ancient north Briton" , "N. British tribesman" , "Very old person" , "Early Scot" .)