Certain significant others, informally

BFS

Think of a casual term for partners that sounds like it's missing a letter.

The clue "Certain significant others, informally" hints at a casual term for boyfriends. "BFS" is a shorthand abbreviation often used in texting or online slang to mean "boyfriends." The answer plays on the informal nature of the clue, using a common abbreviation rather than the full word. It’s a straightforward example of how crosswords sometimes use modern slang or abbreviations.