Q.I Have A (supposedly) Clematis Which Was Given To Me 5 Years Ago All It Produces Is Catkins
It was grown from a cutting.
Certified GKH Gardening Expert
It is very hard to say from this photo. I cannot, clearly, see the shape of leaves, and flower catkins to know if it is, in fact, a Clematis.
Usually, failure to bloom is from pruning at the wrong time, or having a variety that will not do well in your area.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/vines/clematis/pruning-clematis-vines.htm
https://www.gardeningknowhow.com/ornamental/vines/clematis/getting-clematis-to-flower.htm
https://www.gardeningknowhow.com/ornamental/vines/clematis/growing-clematis.htm