Leather
The leather radical and the leather kanji are exactly the same! Cool!
かく
かわ
None
One way to get leather is to skin a male chicken, a cock (かく). Not a very efficient way to get leather, but one way nonetheless.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up what ever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.