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They made it perfectly clear they were not willing to accept a partial solution.

Is "it" a dummy direct object and they were not willing to accept a partial solution an extraposed object in the sentence above?

Is "perfectly clear" an adverb phrase and modifier of the predicator "made" in that sentence?

Comments  
anonymousIs "it" a dummy direct object and they were not willing to accept a partial solution an extraposed object in the sentence above?

I would say it's "(that) they were not willing to accept a partial solution", but yes.

anonymousIs "perfectly clear" an adverb phrase and modifier of the predicator "made" in that sentence?

I call it adjectival on the "that" clause.

anonymousanonymousIs "perfectly clear" an adverb phrase and modifier of the predicator "made" in that sentence?I call it adjectival on the "that" clause.

So, you see "perfectly clear" as an adjecive phrase - grammatically, a complement of the dummy "it", don't you?