### Clue: One in spirit of party always backed line on the French Resistance (8)
### Answer: REVELLER 
 ### Explanation: Definition: One in spirit of party
 **Reversal of**(… backed) EVER(always;at all times) + L(abbrev. for "line") + LE(French for "the") + R(symbol for electric resistance in physics).
Defn: A party animal.