Achieve with effort (6)
I believe the answer is:
attain
'achieve with effort' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for attain that I've seen before include "Succeed in doing, get there" , "Succeed in getting or doing" , "Manage to get" , "Reach, get there as with ambition" , "Reach or gain" .)