Failure of concentration (5)

I believe the answer is:

lapse

(Other definitions for lapse that I've seen before include "Go back to bad behaviour" , "Inadvertent error" , "Slip, error" , "Slip back" , "breach of protocol?" .)

I've seen this clue in The Wall Street Journal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.