A good way to work the land, mostly (3)
I believe the answer is:
far
'a good way' is the definition.
(I've seen this in another clue)
'work the land mostly' is the wordplay.
'work the land' becomes 'farm' (I've seen this before).
'mostly' means to remove the last letter (most but not all of the word).
'farm' with its last letter taken off is 'FAR'.
'to' is the link.
(Other definitions for far that I've seen before include "A long, long way to go" , "Remote" , "At a great distance way" , "Very much" , "Distant" .)