Reportedly in France, you perform black magic (6)
I believe the answer is:
voodoo
'black magic' is the definition.
(I've seen this in another clue)
'reportedly in france you perform' is the wordplay.
I cannot quite understand how this works, but
'perform' could be 'do' (both can mean complete an action) and 'do' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for voodoo that I've seen before include "Caribbean religious cult" , "Religious cult involving witchcraft" , "System of witchcraft" , "Form of magic" , "Black magid from West Indies" .)