assistant in wine shop, groom
倌 centers on a person who serves or attends to others in a specific setting: an assistant in a wine shop or a groom who tends to horses.
倌 combines 亻 (person) with 官, which likely contributes both sound and the idea of an official or manager, suggesting a person in a service role.
A person 亻 beside 官 (official) works as an assistant in a wine shop or a groom: someone who serves in an official-like capacity.
For カン, imagine a groom holding a can of polish for the horses: can -> カン, and the person serves as an assistant.