### Clue: Cover heads of old Ukrainian ladies in essential oil (9)
### Answer: PATCHOULI 
 ### Explanation: Definition: essential oil
 PATCH(a piece covering a small area, such as an eyepatch, or an elbow patch) + **1st letters, respectively, of**(heads of) "old Ukrainian ladies in".
Defn: … used in perfumery, insecticides and medicine.