### Clue: Late enquiry about queen's hairdo (4)
### Answer: PERM 
 ### Explanation: Definition: hairdo
  PM($$p$$ost-$$m$$ortem,an enquiry into the death of a person, the late so-and-so) **containing**(about) ER($$E$$lizabeth $$R$$egina,queen)
Defn:  Short for permanent wave, so-called because the chemicals used caused the hair to curl permanently, sort of.