Following rules has shortcoming (4)

I believe the answer is:

flaw

(Other definitions for flaw that I've seen before include "Weakness" , "Imperfection or blemish" , "failing" , "Defect, imperfection" , "Error in theory or plan" .)

I've seen this clue in The Sun.

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.