2019 #1 hit by Shawn Mendes and Camila Cabello (8)

I believe the answer is:

senorita

(Other definitions for senorita that I've seen before include "Miss when in Madrid" , "Young Spanish lady" , "Young Spanish woman for notaries" , "Abroad, miss" , "miss from Valencia" .)

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

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