Ancient Semitic idol (4)
I believe the answer is:
baal
'ancient semitic idol' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for baal that I've seen before include "alse god" , "God Elijah defeated" , "Canaanite fertility god" , "Fertility god (false to some)" , "Hellish idol" .)