Obtain through effort (4,2)
I believe the answer is:
drum up
'obtain through effort' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for drum up that I've seen before include "Try to get (something) by canvassing" , "Attempt to get support by canvassing" , "Bring about (something) by constant and persistent effort" , "To attract" , "Attempt to obtain (support)" .)