Clue: Ambush European soldier heading north, such as Cyrano de Bergerac (4,4)
Answer: NAME PART
Explanation: Definition: such as Cyrano de Bergerac
 **Reversal of**(… heading north, in a down clue) [ TRAP(to ambush/to lie in wait to spring a surprise attack) + E(abbrev. for "European") + MAN(a soldier/a member of the armed forces) ].
Defn: The character part/role after whom the drama is named, an example being/such as "Cyrano de Bergerac".