wickerwork, (ghost kanji)
椦 is a rare kanji associated with wickerwork, but it is also noted as a ghost kanji, meaning its actual usage and meaning are uncertain. Treat its meaning as unclear.
The exact historical development of 椦 is uncertain. It is a rare character, and its status as a ghost kanji suggests its origin may be obscure or based on a misrecorded form.
The left side is 木 (tree/wood), and the right side 劵 looks like a tool or frame. Picture wood bent into a woven shape, like wickerwork, but remember this kanji is rare and its meaning is not firmly fixed.
For ケン, imagine a ken (a traditional Japanese unit of length) of wicker material being woven: ken -> ケン, and the wood is shaped into a basket.