I.R.S. investigator, in old lingo

Let's find possible answers to "I.R.S. investigator, in old lingo" crossword clue. First of all, we will look for a few extra hints for this entry: I.R.S. investigator, in old lingo. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.