Wise man's got millions, working unaided to begin with (7)
I believe the answer is:
solomon
'wise man's' is the definition.
(wise man in the Bible)
'millions working unaided to begin with' is the wordplay.
'millions' becomes 'm' (abbreviation).
'working' becomes 'on' (on can mean working or activated).
'unaided' becomes 'solo' (solo means on one's own).
'to begin with' says to put letters next to each other.
'm'+'on'='mon'
'mon' after 'solo' is 'SOLOMON'.
'got' acts as a link.
(Other definitions for solomon that I've seen before include "Wise old king of Israel" , "King of Israel with great wisdom" , "Very wise ruler" , "King of Israel noted for his wisdom" , "Old king of Israel famous for wisdom and magnificence" .)