Rub with oil (6)
I believe the answer is:
anoint
'rub with oil' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for anoint that I've seen before include "Apply consecrated oil to" , "Consecrate with oil or ointment" , "Bless with holy oil" , "Consecrate with sacred oils" , "Bless with sacred oils" .)