Wasn't it there last year? It doesn't look like something that's germinated this year
The description sounds like crocosmia but this isn't crocosmia
Irises all come up as a single spear, did they do that?
Can you do a photo?
show us a photo of the leaves and root, that'll do it
your third pic is elder, Sambucus nigra
and the one after that looks like an achillea
There are lots of non-climbing clematis
no idea which that one is
that's good Mutch, you can sleep tonight now
This might be some sort of persicaria
My enchanters nightshade has white flowers
definitely not JKW