The RHS website indicates that different varieties of clematis can fall into one of three 'pruning groups', so you really ought to find out which group applies to your particular variety.
However for Group 1 this is stated:
"For this group no regular pruning is required, but if necessary, prune immediately after flowering in mid- to late spring when the danger of frost has passed".
For Group 2:
"Prune in late winter or early spring (February) . . . "
For Group 3:
"In February or March . . .
So it would seem that you shouldn't be considering pruning until February at the earliest, so you should definitely leave it to grow for now:
https://www.rhs.org.uk/advice/profile?PID=97