Smith, the singer, has song for a biblical region (7)
I believe the answer is:
samaria
'biblical region' is the definition.
(region in the Old Testament)
'smith the singer has song' is the wordplay.
'smith the singer' becomes 'Sam' (British singer Sam Smith).
'has' is a charade indicator (letters next to each other).
'song' becomes 'aria' (aria is a kind of song).
'sam'+'aria'='SAMARIA'
'for a' is the link.
(Other definitions for samaria that I've seen before include "region of ancient Palestine" , "Biblical land" .)