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"puzzle" is also used as a crossword clue. If that's what you saw, the answer is often conundrum (9 letters).
Definitions
be a mystery or bewildering to
Word origin
The noun appears to be derived from the verb.
Used in a sentence
“Certainly, Men in Great Fortunes, are ſtrangers to themſelues, and vvhile they are in the puſle of buſineſſe, they haue no time to tend their Health, either of Body, or Minde.”
“She stopt, felt herself getting into a puzzle, and could not be prevailed on to add another word, not by dint of several minutes of supplication and waiting.”
“My lady—your ladyship. It sounds very strange, and as if it was not natural. I never thought of it before; but, now you have named it, I am all in a puzzle.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Problem to solve”6 letters
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