Farmland? Something money’s put into over time (7)
I believe the answer is:
tillage
'farmland?' is the definition.
'something money's put into over time' is the wordplay.
'something money's put into' becomes 'till'.
'over' is a charade indicator (letters next to each other).
'time' becomes 'age' (age is a kind of time).
'till'+'age'='TILLAGE'
(Other definitions for tillage that I've seen before include "Preparing for cultivation" , "Cultivation of the land" , "Working of the soil" , "Cultivation of fields" , "Agricultural work" .)