(Land) suitable for growing crops (6)
I believe the answer is:
arable
'land suitable for growing crops' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for arable that I've seen before include "(Of land) capable of producing crops" , "Sort of land" , "Of land, fit for growing crops" , "Land suitable for growing crops" , "Fertile" .)