Crossword Genius

"If ___!” (4)

Ross

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4

7

(Other definitions for only that I've seen before include "Siblingless (child)" , "Exclusive - individual" , ". . . . the Lonely (sung by Roy Orbison)" , "Solely, lone" , "Existing alone with no other, perhaps a child" .)

I've seen this clue in The Wall Street Journal.
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