Get moving to get better (4-2)
I believe the answer is:
come-on
'get' is the definition.
(I know that come on is a is a more specific form of the action get)
'moving to get better' is the wordplay.
I cannot really see how this works, but
'to get' could be 'come' ('come' can be a synonym of 'get') and 'come' is located in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for come-on that I've seen before include "Make progress or meet unexpectedly" , "Make progress, thrive" , "Develop - hurry up!" .)