Cloche is generally used to mean a solid glass or plastic that is used in cold weather like a mini greenhouse over one plant. You are just talking about row cover and it is readily available at garden stores or on-line (maybe even big box stores, I don't know). It is easy. You just need some kind of frame that is sturdy enough to stay put in wind and rain. I use the wire frames that political yard signs come on, but you can use anything.
You will need something like earth staples to hold it down at the bottom:
https://www.veseys.com/ca/en/images/prod ... /10024.jpg
also available at garden stores, big box, on-line etc. Of course you can just use a row of rocks but the earth staples are very convenient.