### Clue: Teaching flower arrangement to rock singer? (7)
### Answer: LORELEI 
 ### Explanation: Definition: rock singer
  LORE(the knowledge,teaching that is traditionally handed down the generations) + LEI(an arrangement of flowers as a garland worn round the neck, from the Hawaiian language).
Defn. and Answer:  Alternatively spelled as Loreley.  Legendary German feminite water spirit similar to the Sirens,singers of Greek mythology, associated with the Loreley, a rock on the eastern bank of the Rhine.  I liked the defn.