@Corrine Duncan
We implemented Clever this Summer in order to integrate with VHL Central for books and pre-populate rosters for out teachers. We haven't had the opportunity to use it more but I assume that will happen in the future. At the very least I wanted to write down the steps I go through to sync with Clever which may help you. Their support is great, although a little slow to start.
We integrate with Clever using OneRoster 1.1. After Clever sets up your platform internally to support this (important), You can use SFTP and submit the OneRoster zip file.
Changes to the OneRoster folder required to sync with Clever:
Hope this helps!