Ali Baba's opening word? (6)

I believe the answer is:

sesame

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'opening word?' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for sesame that I've seen before include "Plant yielding seeds used for flavouring bread" , "Open . . . . . . is a magic phrase to gain entry" , "Open ...... is magic phrase for obtaining access" , "Opening word for the oilplant?" , "Seed or oil used in cooking" .)

I've seen this clue in The Sun.

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