lacquered dish
楪 centers on a lacquered dish, specifically a wooden serving vessel coated with lacquer.
楪 combines 木 (tree, wood) with 枼, which likely contributes the sound. The character is used for a wooden lacquered dish.
The left side is 木 (wood), and the right side 枼 resembles a dish shape. Picture a wooden dish coated with shiny lacquer.
For チャ, imagine a lacquered dish being used to serve tea (茶, ちゃ): tea -> チャ, and the dish holds the tea.
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type of lacquerware plate