Clematis avalanche - dead???

in Plants
Hi, has my lovely avalanche met it’s maker??? It was lush and green all through winter, buds appeared in late march but it’s since looks dry, no flowers and generally unhappy. Some brown leaves, some still green but defo unhappy. It was moved from the ground to a pot end of last summer but seemed really happy for months after that. Any ideas?
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A picture might elicit more expert help from others.
Although they need water it needs to be free draining especially over winter, so is the pot off the ground?
More information https://thorncroftclematis.co.uk/clematis-avalanche-8003-p.asp
Also how to grow in containers on their site.
https://thorncroftclematis.co.uk/how-to-plant-clematis-32-w.asp