Summon a genie? (3)
I believe the answer is:
rub
'summon a genie?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rub that I've seen before include "Cause friction" , "Ointment; chief difficulty" , "Polish by friction" , "Chafe; difficulty" , "Polish - difficulty" .)