The clue "Callas number" last appeared in the Universal crossword on March 1, 2016. The correct answer for this puzzle is "ARIA", a 4-letter word.
Solution ARIA is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is ARIA with 4 letters, and the shortest is ARIA with 4 letters.
No, "CALLAS NUMBER" hasn´t seen a spike right now. Solvers are most interested in: Saddle, Swarm, Guide, Public and Rest.
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The solution is 4 letters long.