What are your cloche supports, and what is the covering?

If you are using pvc-type tubular hoops, you can make "clips" out of a
larger pvc size; the best would be to go larger than you think you
need, and use a thin layer of ?felt/fabric to permit the "clamp" to
squeeze your cloche material without the potential for rubbing holes
in it. The clamp is a short length of material slit down one side,
maybe a couple inches in length. It might even be possible to use
clothespins (spring-type) if the pvc is small enough..

I use a heavy duty wire for supporting plastic and re-inforced
floating row cover. Each "leg" has a small loop in it that when the
support is in the ground, ends up at ground level. I run a string
through these loops, crossing over each loop/support from one side to
the other. This keeps a good tension on the material, but also lets
me slide the material up on warm days (plastic) or to check on
plants,weeds, etc for the row cover.

Not an original idea, I learned this from Eliot Coleman - great
resource for gardening in all seasons.

Cheers!