Answer:
Appositive phrase
Step-by-step explanation:
In the text presented in the question aciama, the clause "a former drug-addict" is an appositive phrase. Appositive phrase is a type of clause that aims to explain something, or bring extra information, about the previously mentioned term, which is usually a pronoun or a noun. As we can see in the text presented above, the clause "a former drug-addict" has been added in the text, to show extra information about "Sam Smith," which was quoted earlier.
However, we must emphasize that the text has a grammatical error. This is because every appositive phrase must be written in the middle of two commas and the text is not showing this.