A sign Israel endlessly is in turmoil (5)
I believe the answer is:
aries
'a sign' is the definition.
(Aries is an example)
'israel endlessly is in turmoil' is the wordplay.
'endlessly' means to remove the last letter.
'is in turmoil' indicates anagramming the letters (I've seen this in other clues).
'israel' with its final letter taken off is 'israe'.
'israe' is an anagram of 'ARIES'.
(Other definitions for aries that I've seen before include "Zodiacal sign also known as the Ram" , "A sign from Heaven" , "First sign of the zodiac" , "Stars" , "Zodiac ram" .)