Oleaginous charm (7)

I believe the answer is:

unction

(Other definitions for unction that I've seen before include "Act of anointing a monarch with oil" , "Greasiness" , "Insincere charm - anointing" , "Act of anointing someone as part of a rite" , "Ritual anointing with oil" .)

I've seen this clue in The Guardian.

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