Bogus quarter (4)
I believe the answer is:
slug
'bogus quarter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for slug that I've seen before include "Kind of snail without a shell - or a bullet" , "Garden mollusc" , "Projectile fired from a gun" , "Small creature like snail without shell" , "Wallop" .)