Work do (3)
I believe the answer is:
act
I believe this is a double definition.
'work' is the first definition.
(synonyms)
'do' is the second definition.
(I've seen this in another clue)
(Other definitions for act that I've seen before include "Function" , "Routine" , "Do something, in a play?" , "Take steps" , "Do something (on stage?)" .)