Best candidates for permanent relationships

KEEPERS

Think of what you’d call someone worth holding onto forever in a romantic or platonic sense.

The clue plays on the double meaning of "keepers." In relationships, a "keeper" is someone worth holding onto long-term—an ideal partner. But it also hints at the literal word "keepers," as in people or things you choose to keep permanently. The phrasing cleverly suggests both the emotional and literal sense of the word.