Clue: Tale about mother in dress of Hindu ex- resident at 12 (4,5)
Answer: LISA MARIE
Explanation: Definition: ex- resident at 12

**LIE** ("tale") *about* **MA** ("mother") *in* **SARI** ("dress of Hindu")
 
*Refers to Lisa Marie Presley, Elvis Presley's daughter, the 12 in the clue being Graceland, the solution to 12ac.