Oil source for thousands of years (6)

I believe the answer is:

sesame

(Other definitions for sesame that I've seen before include "Oil plant from Ali Baba's cry" , "Open ...... is magic phrase for obtaining access" , "Opening word for a magician" , "Open ...... is magic phrase for opening door in pantomime" , "Plant with oily seeds" .)

I've seen this clue in the Newsday.

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