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"smirky" is also used as a crossword clue. If that's what you saw, the answer is often smug (4 letters).
Definitions
Smirking, or as if smirking
Word origin
From smirk + -y.
Used in a sentence
“He introduced himself, smiling a smirky smile borrowed from the courtiers of the stage, […]”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Wearing a smug smile”6 letters
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