Cultivation (7)
'cultivation' is the definition.
(I know that tillage is a type of culture)
This is all the clue.
(Other definitions for tillage that I've seen before include "Agricultural work" , "Cultivation of fields" , "Cultivation of the land" , "Farmers undertake it" , "Working of the soil" .)
'cultivation' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for tilth that I've seen before include "sow here" , "Cultivated land" , "Arable land that is worked by ploughing and sowing" , "Ploughed land" , "Sort of soil" .)