### Clue: Returned without delay to study area – this one's in the US (8)
### Answer: PASADENA 
 ### Explanation: Definition: this one's in the US 
 **Reversal of**(Returned) ASAP(acronym for "as soon as possible";without delay) **plus**(to) DEN(a study;a room to retreat to) + A(abbrev. for "area").