Gardener gathering cheap crop ultimately for grain bin (6)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Gardener gathering cheap crop ultimately for grain bin <chea> P <cro> P (“ultimately” means last letter of each word only is used) in HOER (=gardener); a hopper is a container in which seed is carried for sowing, hence “grain bin”