This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
秥 combines 禾 (grain) with 占, but the exact historical development and original meaning are uncertain. It may have been a variant or regional character related to grain or rice.
The left side 禾 suggests grain or rice, and the right side 占 looks like a divination or measurement. Picture a rare character for a specific grain-related concept, but its exact meaning is unclear.
For デン, imagine a den of ancient scribes measuring grain with 占-like tools: den -> デン, and the grain 禾 is being recorded.