Possible Clues:

• Till work for one
• He's not at the tiller, he is one
• He lives off the land
• Old Macdonald, the tax-collector?
• The guy associated with 64-Across, e.g.
• Not the sort of tiller you'd have on a yacht
• George Macdonald was one ...
• The ___ in the dell
• There's little doubt one's cultivated
• One's on land, at a distance from the sea in France