Parsing

The content clause is an extraposed object.

Very clear is an adjective phrase functioning as an objective predicative complement.

Aspara GusVery clear is an adjective phrase functioning as an objective predicative complement.

Thank you, AG, for your useful reply.

I'd argue that the very clear phrase here is an adverbial with the meaning in a clear manner. But I'm a non-native so my intuition may be tinted with my native tongue colouring.

Anonymouswith the meaning in a clear manner.

The problem is that it doesn't mean "in a clear manner". At the end of the process of making "it" clear, "it" is clear. It's not that "it" is in a clear manner, whatever that might mean.

In other words,

The fact that what we're out to protect is the national interest in (these things)

Thank you, CJ, for your clear explanation. The grammar structures of my native languages often are in conflict with the English grammar hence sometimes those outlandish interpretations of mine. I've understood it, wrongly as you pointed it out very clearly, that the very clear modifies the whole main clause We have made it very clear.

AnonymousThe grammar structures of my native languages often are in conflict with the English grammar

That often happens because sometimes two languages have the same structures to say the same thing, which makes learning seem easy, but then you come across other situations where the two languages have different structures to say the same thing, which makes le

Yes, I couldn't agree more.