### Clue: 'This war's over!' — that fake article by nuclear project (9)
### Answer: MANHATTAN 
 ### Explanation: Definition: nuclear project
A charade of MAN, a reversal ('over') of NAM (Vietnam, 'this war') plus HATT, an anagram ('fake') of 'that' plus AN (indefinite 'article'), for the World War II development of the atom bomb.