earthen stand for wine jug
罏 refers to a specific type of earthenware vessel used as a stand or container for a wine jug. Its meaning is narrow and concrete, centered on this traditional ceramic object.
罏 combines 缶 (earthenware jar) with 盧, which likely contributes the sound. The character was created to name a specific type of pottery stand.
The left side 缶 is a clay jar, and the right side 盧 looks like a sturdy stand. Picture an earthenware stand holding a wine jug: 罏 is that stand.
For ロ, imagine a low earthen stand holding a wine jug: low -> ロ, and the stand sits low to the ground.