Eventually completed this but one or two parses have me foxed. I'll wait a while and see if anyone else raises them. It was difficult to get started but once the lower right clash appeared things got moving.
I'm really confused with this clashing thing and 90 degree symmetry thing. So are several letters from one word and several from another all in one cell? Or is that totally wrong. I might give up if I can't even understand what to do!!
lewap - this one had me flummoxed for a long time even after I had solved it.
You are looking for the name of a kind of pasta, middle letter ("core") removed, inside a Shakespearean word for "place", last three words of the clue are the definition.