First letter of the Hebrew alphabet (5)
I believe the answer is:
aleph
'first letter of the hebrew alphabet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aleph that I've seen before include "Sign of a beast? A Phoenician" , "First letter of the Hebrew alphabet" , "Abroad, a" , "Hebrew character" , "First character" .)