noun clause / part of speech

[Mohammad]

Some will continue to ask the question "whether the war was worth the price."

(whether the war was worth the price)

The book answered it as an appositive, but the author did not explain how the idea is.

Let me take some discussion

Whether the war was worth the price, some will continue to ask the question.

Here in the above new sentence it seems to me, an adverb of reason or condition modifies the whole next clause.

It can be illustrated as an appositive in only one way:

If it replaces the word " question" i.e. some will continue [ whether the question about war was worth the price or not]

the question = Whether the war was worth the price.

Whether the war was worth the price = the question

Am I right or not?

[Mr Greg]

You are correct in your analysis regarding the use of the phrase "whether the war was worth the price" as an appositive in the sentence structure you've described. An appositive is a noun or noun phrase that renames or clarifies another noun next to it.