He was wise, unaccompanied Scotsman (7)
I believe the answer is:
solomon
'he was wise' is the definition.
(King Solomon, wise and wealthy biblical King)
'unaccompanied scotsman' is the wordplay.
'unaccompanied' becomes 'solo' (I've seen this before).
'scotsman' becomes 'mon'.
'solo'+'mon'='SOLOMON'
(Other definitions for solomon that I've seen before include "King of Israel noted for his wisdom" , "Sage" , "Biblical wise king" , "King of Israel with great wisdom" , "King known for wisdom" .)