It is eventually going to grow larger than that space allows.

I have seen Clematis used nicely on bird feeder posts but they were allowed to flop back down and spread a lot wider than your pictures show. They were on 4 x 4 posts wrapped with metal wire mesh fencing.

Yes, dead stems in winter.

Thanks for the info!!! Im so indecisive...So where would u plant it??... in the front around the birdfeeders or in the pot and grown up the trellis on the right of the shed? If I mulch the bottom of the vines and or plant low shrubs can the top handle over 6 hrs of sun or will my leaves brown? My hydrangeas there fry in the summer

You can see a young-ish (maybe 3 years?) DH Young clamboring up the trellis in front and starting to rebloom. I'm working on training her across the climbing High Noon that is to her right....

Here she is a bit further into the rebloom