A plant ma sees in a new light (6)

I believe the answer is:

sesame

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'a plant' is the definition.
(sesame is a kind of plant)

'ma sees in a new light' is the wordplay.
'ma sees' anagrams to 'SESAME'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for sesame that I've seen before include "Open ...... is magic phrase for obtaining access" , "Password of the Arabian Nights" , "Part of code for opening" , "Plant cultivated for seeds providing oil" , "Crop valued for its seeds and oil" .)

I've seen this clue in the Evening Standard.

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