Not wholly employed on the stage (2,4)
I believe the answer is:
in part
'not wholly' is the definition.
('in part' is the opposite to 'wholly')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for in part that I've seen before include "Not fully engaged" , "To some extent (though not entirely)" , "to some degree" , "No longer resting as actor" .)