Israelite leader some confused with Samaritan leader (5)
I believe the answer is:
moses
'israelite leader' is the definition.
(I've seen this before)
'some confused with samaritan leader' is the wordplay.
'confused with' is an anagram indicator.
'leader' suggests taking the first letters.
The first letter of 'samaritan' is 's'.
'some' with its letters anagrammed with 's' can make 'MOSES'.
(Other definitions for moses that I've seen before include "Grandma - - , painter" , "Leader of Jewish Exodus" , "He parted the Red Sea" , "Biblical prophet" , "Hebrew prophet and lawgiver" .)