Michael

No, sorry

This? https://www.freshports.org/net/clash/

https://www.reddit.com/r/OPNsenseFirewall/comments/zy5u4d/new_community_repo_plugin_clash/

Anything in System : Log Files : General?

/usr/local/etc/rc.d/clash restart Maybe, I dont use it myself

Sorry cant help here since I only build plugins but dont use them (besides AdGuard)

You can install the plugin, enter your config to the text box and check if it works :)

System: Firmware: Plugins: search for clash .. its there

It was the work of @mihakralj .. no idea if he' still active.

In a couple of weeks, yes