Unaccompanied male operating, a wise man (7)
I believe the answer is:
solomon
'a wise man' is the definition.
(I've seen this before)
'unaccompanied male operating' is the wordplay.
'unaccompanied' becomes 'solo' (I've seen this before).
'male' becomes 'm' (common abbreviation).
'operating' becomes 'on' (I've seen this in other clues).
'solo'+'m'+'on'='SOLOMON'
(Other definitions for solomon that I've seen before include "Son of King David" , "Wise man" , "OT king" , "Biblical wise king" , "Proverbially wise king" .)