Clue: Article about unknown American soldiers by the cut-off Israeli city (8)
Answer: NAZARETH
Explanation: Definition: Israeli city
 **Reversal of**(… about) AN(an article in English grammar) + Z(in mathematics, an unknown variable) + A(abbrev. for "American") + RE(abbrev. for the Royal Engineers, a unit of soldiers in the British Army) **plus**(by) "the" **minus its last letter**(cut-off).