Biblical affirmative (3)
I believe the answer is:
yea
'biblical affirmative' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yea that I've seen before include "Affirmative vote" , "'She loves you, ... ... ...' (The Beatles)" , "-- or nay?" , "Emphatic agreement" , "Approval" .)