Undercover activity?

This time we are looking on the crossword clue for: Undercover activity?.
it’s A 20 letters crossword puzzle definition. See the possibilities below.

Did you find what you needed?
We hope you did!. If you are still unsure with some definitions, don’t hesitate to search them here with our crossword solver.

Possible Answers: SLEEP, SLUMBER.

Last seen on: –Wall Street Journal Crossword – May 11 2020 – Shake It Up
NY Times Crossword 24 Mar 20, Tuesday
Wall Street Journal Crossword – Jan 17 2019 – Boosts