Crossword Genius

She has the master key (3)

Ross

I believe the answer is:

mae

'she' is the definition.
(I've seen this before)

'the master key' is the wordplay.
'the master' becomes 'MA' (Master of Arts).
'key' becomes 'e' (musical key).
'ma'+'e'='MAE'

'has' acts as a link.

(Other definitions for mae that I've seen before include "- West, US film actress" , "Girl" , "more Scots" , "The first Hollywood blonde femme fatale, . . . West" , "Woman" .)

I've seen this clue in the Evening Standard.
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