Hey all! We are in release preview for 2018.1 right now, and we discovered that the Clearing checkbox (labeled as "Clr") was not showing up. Our resource at NetSuite is claiming that this functionality may just be going away, which would be catastrophic for our business as we use this functionality for a variety of clearing accounts. Does anyone else use this "Clr" functionality in NS, and know anything about if it really is going away in 2018.1 without any option to keep it on?

Are you referring to a "clearing account" or the clearing (clr) checkbox used for reconciling bank accounts? See SuiteAnswers Answer Id: 61392 regarding reconciliation. It was last updated 03/05/2018 and is still relevant in RP for 2018.1.