Several CBS dramas

CSIS

This trio of letters often appears at the end of crime-solving show titles that share a common investigative theme. Think of a well-known Canadian agency.

The clue plays on the abbreviation "CBS," which stands for the TV network Columbia Broadcasting System. "Several CBS dramas" hints at taking multiple letters from "CBS"—specifically, the first letters of each word in "Columbia Broadcasting System" (C, B, S) to form "CSIS." It’s a clever way to misdirect by making you think of TV shows while actually pointing to the initials of the network’s full name.