Clue: Dramatic heroine given latitude in court bench introducing explosive stuff (7)
Answer: BLANCHE
Explanation: Definition: Dramatic heroine
**L** (latitude) *in* **BANC** ("court bench") *introducing* **HE** (high explosive, so "explosive stuff"). 
 
 
*Refers, I assume, to Blanche DuBois in *A Streetcar Named Desire*.