Crossword Genius

She’s undergoing supervised professional training, one after another it’s said (6)

Ross

I believe the answer is:

intern

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'she's undergoing supervised professional training' is the definition.
I can't tell whether this definition defines the answer.

'one after another it's said' is the wordplay.
'one after another' becomes 'in turn' (I've seen this before).
'it's said' shows a homophone (sound like).
'inturn' is a homophone of 'INTERN'.

Can you help me to learn more?

(Other definitions for intern that I've seen before include "Confine the hospital doctor" , "Supervised medical graduate" , "Medical graduate trainee" , "Official language of Pakistan" , "Novice gaining experience" .)

I've seen this clue in the Sydney Morning Herald.
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