Clematis take several years to get established but some do grow big enough for what you want to do. Many won't.

What about silver lace vine? Anyone ever planted it?

Sliver lace vine, Polygonum aubertii, is an unofficial noxious weed in western Washington. According to the Garden Wise association between the WNSLA and the WA State Noxious Weed Control Board, this planting option is suggested to be replaced with Clematis or our native honeysuckle, Lonicera ciliosa

Another option I'd consider would be chocolate vine, Akebia quinata, which is very tolerant of part shade, produces fragrant spring flowers and is mostly evergreen. Can be problematic in other parts of the country but no invasive issues here.

A neighbor had silver lace vine all over one side of his garage, took it out. Looked pretty messy to me.

In my experience Honeysuckle does not do too well in part shade simply because of powdery mildew.

I would personally go with a Clematis or Wisteria

What about Holboellia coriacea? I don't know if it commonly produces fruit or not, which could be messy, because my plant is small and hasn't even flowered yet. I also like the Akebia suggestion - it's one of my favourite vines.

Would some variety of Grape fit the bill?
You wouldn't get the bumper crop you would get in full sun, but grapes can handle quite a bit of shade and still produce some grapes.
Mike

I love akebia as well, but already have it (the white and the purple) in a couple of areas and was looking to branch out a bit. Same with wisteria. I have a long wisteria walkway that runs the length of our house.

A grape might work. I hadn't really thought of that.

Dutchmans pipe vine (Aristolochia durior)

fast growing vine with large heart shaped leaves
flowers small late spring or early summer
some say flowers stink
20 feet tall & wide

Have you considered a climbing hydrangea? My neighbor has one that is breathtaking. Probably doesn't get more than 4 hours of sunlight per day.

Mildew is the result of genetic susceptibiliy combined with dry or drying soil and damp foliage. That's why it becomes noticeable as summer advances. Low growing season rainfall and summer fogs/dews of the Pacific Coast are probably just about ideal.

Some kinds of honeysuckle mildew readily and others do not. Lonicrea periclymenum 'Serotina' is quite a good one overall, and it does not get covered in mildew.