The clue "Operating smoothly, as an engine" last appeared in the New York Times crossword on March 6, 2018. The correct answer for this puzzle is "PURRING", a 7-letter word.
Solution PURRING is 7 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is PURRING with 7 letters, and the shortest is PURRING with 7 letters.
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The solution is 7 letters long.