Ancient Scot chose to be heard (4)
I believe the answer is:
pict
'ancient scot' is the definition.
(Picts were an ancient people of Scotland)
'chose to be heard' is the wordplay.
'chose' becomes 'picked' (picking is a kind of choosing).
'to be heard' indicates a 'sounds like' (homophone) clue.
'picked' is a homophone of 'PICT'.
(Other definitions for pict that I've seen before include "Ancient Scot in Roman times" , "Scotsman" , "N. British tribesman" , "Ancient north Briton" , "Literary term for painted woman" .)