Crossword Genius

A word to open with (6)

Ross

I believe the answer is:

sesame

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'a word' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'open with' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'to' is the link.

Can you help me to learn more?

(Other definitions for sesame that I've seen before include "'Open . . . . . .'' is a magic phrase to gain access" , "Open ...... is magic phrase for obtaining access" , "Plant yielding seeds used for flavouring bread" , "Plant cultivated for its seeds - opening word?" , "Oil-producing plant" .)

I've seen this clue in the Evening Standard.
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