I know that sounds like a bit of an oxymoron, but read about clematis in a hanging basket and like the idea. However as a novice I don't want to spend good money on a plant and it won't work. Has anyone tried this? Did it grow long? Is gravity enough to make the plant grow (down)?
Many climbing plants will flop if not tied in. However, the effect isn't usually very attractive, and you risk getting stems broken etc. Some of the tiny wee plants that are popular for hanging baskets sort of scramble upwards a bit, but that's quite different from true big climbers.
Why not use trailing plants instead? There are loads! Including trailing clematis (aromatica).