This clue appeared in the NYT Crossword on Sunday, March 8, 2026 (77 Across). The answer is hidden below until you want it. Sunday puzzles are large (21 by 21) and themed, about as hard as a Wednesday or Thursday.
Answer length: 3 squares
First letter
S _ _
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About the answer
SIS as a word: (British) Initialism of Secret Intelligence Service. [(UK, formal) MI6]; Initialism of Schengen Information System.
SIS has been an answer 15 times in the NYT Crossword and Mini since November 24, 2025.
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