Tribe of Israel (4)
I believe the answer is:
levi
'tribe of israel' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for levi that I've seen before include "Hebrew patriarch - Italian writer" , "The Strauss who first patented blue jeans" , "Jewish priestly tribe" , "Primo --, Italian writer and chemist" , "Tribe of Israel" .)