Enter a clue or pattern or both:
The ClueMarcel Marceau, for one (4 letter answer)
NotesThe answer APER is seen frequently, appearing about once every 70 puzzles.
David Frye is one
Little or Frye
Rich Little, e.g.
DefinitionAPER as a noun:
1. (copycat, imitator, emulator, ape, aper) = someone who copies the words or behavior of another