Until the popcorn finishes popping/ is that a phrase or clause

Clause

A Phrase doesn't have a subject or a verb.

A Clause does.

The sentence both has a subject (popcorn) and a verb (finishes)

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what passage could you provide the passage.

chapter i -- paris: september, 1792

a surging, seething, murmuring crowd of beings that are human only in name, for to the eye and ear they seem naught but savage creatures, animated by vile passions and by the lust of vengeance and of hate.

during the greater part of the day the guillotine had been kept busy at its ghastly work: all that france had boasted of in the past centuries, of ancient names, and blue blood, had paid toll to her desire for liberty and for fraternity.

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