Ancient inhabitant of Scotland (4)
I believe the answer is:
pict
'ancient inhabitant of scotland' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pict that I've seen before include "Old Scot" , "Ancient north Briton" , "N. British tribesman" , "Early Scot" , "Very old person" .)