Conductor Riccardo (4)
I believe the answer is:
muti
'conductor riccardo' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for muti that I've seen before include "Conductor" , "traditional medicine in South Africa" , "traditional witchcraft medicine" , "witch-doctor's medicine" , "traditional witch doctor's medicine" .)