Clique works with Grid for me, and did so without any special configuration. Are you sure you didn't inadvertently add Grid to the "ignored frames" list (or remove it from the "click frames" list... I can't recall exactly which way it goes in Clique)? Try deleting your Clique saved variables. If that doesn't work, try deleting your Grid saved variables too. If those both fail, delete both addons and reinstall them. Remember that you need to log out of WoW before you delete saved variables.