Enter a clue or pattern or both:
The ClueCurrency watchdog (4 letter answer)
NotesThe answer TMAN is seen frequently, appearing about once every 130 puzzles.
One of the Feds
Ness, for one
Eliot Ness, for one
Agt. such as Ness
Eliot Ness, e.g.
Eliot Ness, notably
Fed. agent in finances
No friend of the bootlegger
Special agent at D.C.
U.S. special investigator
Tax cheat chaser, informally
One trying to eliminate bad notes
Crime-fighter Eliot Ness, notably
Federal agent investigating taxes, informally