a lot of us who help on these are Yanks who don't have the puzzle, just the info you give us. Since you didn;t tell us what the clue is for the word, you left us totally in the dark.
Interestingly (to me) off the top of my head there is at least one synonym for chiselling/cheating which fits the _ _ G _ _ _ I N G so I can only assume that there are other known letters.