Hello! My answer would have to be:
what does the word facetious mean? Sarcastic and cleverly amusing
what indicates that this is a definiton clue? Commas
In the sentence, it says “my older brother is always facetious, or sarcastic and cleverly amusing, when talking to my friends.”
They are basically giving you the definition of facetious that is after the comma to give you a clue on the definition so you won’t be confused and look it up in a dictionary.
I hope this answers your question.
