### Clue: Steep's a top actress (need to add an "r") (6)
### Answer: DRENCH 
 ### Explanation: Definition: Steep
 DENCH(Judi, a top English actress) **containing**(need to add an) "r". And, and of course, Meryl Streep is a top American actress.
Defn: To soak in water or other liquid.