Final answer:
The phrase is "The calm before the storm" and it is not a clause.
Step-by-step explanation:
The given phrase is: "The calm before the storm". This is a phrase. A phrase is a group of related words that does not contain a subject and a verb. It functions as a single part of speech. In this case, the phrase is a noun phrase because it functions as the subject of a sentence.
Learn more about Difference between a phrase and a clause