Crossword Genius

Seems a show off can magically open doors! (6)

Ross

I believe the answer is:

sesame

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

'seems a show off' is the wordplay.
'seems a' can be anagrammed to 'SESAME'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for sesame that I've seen before include "Plant with oil-rich seeds" , "'Open . . . . . .'' is a magic phrase to gain access" , "Open ...... is magic phrase for opening door in pantomime" , "A seed; a TV Street" , "Oil plant from Ali Baba's cry" .)

I've seen this clue in the Irish Times.
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