Old Scandinavian identifies chap from the south (8)
I believe the answer is:
norseman
'old scandinavian' is the definition.
'norseman' can be an answer for 'scandinavian' (I've seen this before). I'm not certain of the 'old' bit.
'identifies chap from the south' is the wordplay.
'identifies' becomes 'names' ('name' can be a synonym of 'identify').
'chap' becomes 'ron' (short for Ronald).
'from the south' says the letters should be written in reverse (in a down clue, letters go up).
'names'+'ron'='namesron'
'namesron' in reverse letter order is 'NORSEMAN'.
Can you help me to learn more?
(Other definitions for norseman that I've seen before include "A viking, perhaps" , "Scandinavian" , "invader" , "one attacking north-east?" .)