Biblical trio (4)
I believe the answer is:
magi
'biblical trio' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for magi that I've seen before include "men on special quest" , "The sages who visited Jesus and Mary and Joseph shortly after Jesus was born" , "Caspar, Melchior and Balthazar" , "Eastern men of lore; Epiphany figures" , "Sorcerers in ancient times" .)