Crossword Genius

She turns in first class stuff (6)

Ross

I believe the answer is:

marcia

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

'turns in first class stuff' is the wordplay.
'turns in first' becomes 'marci' (I can't explain this - if you can you should believe this answer much more).
'stuff' indicates the central letters (I've seen 'stuffing' mean this).
The central letter of 'class' is 'a'.
'marci'+'a'='MARCIA'

Can you help me to learn more?

(Another definition for marcia that I've seen is " Woman".)

I've seen this clue in The Globe and Mail.
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