She’s undergoing supervised professional training, one after another it’s said (6)
I believe the answer is:
intern
'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" .)