land
畇 centers on land, specifically cultivated or leveled agricultural land. The single given meaning is broad, but the character is rare and its precise nuance is uncertain.
畇 combines 田 (field) with 勻, which likely contributes a phonetic element. The exact historical development is uncertain, but the character is associated with leveling or cultivating land.
The left side 田 is a rice field. The right side 勻 looks like a tool or a person evenly distributing something. Picture a field being carefully leveled and prepared for planting.
For イン, imagine an inn built on a leveled piece of land: inn -> イン, and the field 田 beside the inn is perfectly flat.