Open to take in some work experience (7)
I believe the answer is:
undergo
'experience' is the definition.
(I know that experience is a more specific form of the action the undergo)
'open to take in some work' is the wordplay.
'open' becomes 'undo' (eg opening a bottle).
'to take in' means one lot of letters goes inside another.
'some work' becomes 'erg' (scientific unit of work).
'undo' enclosing 'erg' is 'UNDERGO'.
(Other definitions for undergo that I've seen before include "Submit to an experience" , "experience needed" , "Endure, experience something" , "having to travel by tube" , "Guerdon (anag.)" .)