Crossword Genius

Lock up one acquiring work experience (6)

Ross

I believe the answer is:

intern

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'lock up' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for intern that I've seen before include "Confine the hospital resident" , "Confine to camp" , "Confine - assistant medic in America" , "Confine the hospital doctor" , "put in jail" .)

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