"If ___" (rueful words) (4)

I believe the answer is:

only

(Other definitions for only that I've seen before include "Unique; merely" , "Exclusive - individual" , "Mere" , "Except that; single" , "Single, solitary" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.