### Clue: Line through targets where hydroplant destroyed (8)
### Answer: TELEMARK 
 ### Explanation: Definition: where hydroplant destroyed
 L(abbrev. for "line") **contained in**(through) [ TEE(a T-shaped mark used as a target in certain games like curling) + MARK(another target, eg. of criminal activities).
Answer: The hydroelectric plant in Telemark, Norway, destroyed by the Allies in WW2.