### Clue: Heather in famous commercial battle (10)
### Answer: STALINGRAD 
 ### Explanation: Definition: battle
 LING(the Heather) **contained in**(in) STAR(famous, as in "a star performer") + AD(short for advertisement,a commercial).
Answer: Now Volgograd, scene of a decisive WWII battle between Nazi Germany and its allies against the Soviets.