We’re using the pages option to create checklist for a monthly process that has to be redone every month. Is there a way to just clear out the check marks for when we start the process again?

You could write a script to do it using the API, but I’d probably just use Duplicate Page—make a template page with the checklist and copy it once a month (and delete the fully checked-off page). This will even give you an opportunity to call the page “Checklist (July)” or whatever, just in case there’s any confusion.