Dupin's nom de plume (4 letter answer)
The answer SAND is seen frequently, appearing about once every 140 puzzles.
Box or blast
Color or novelist
Kind of trap
Smooth, in a way
Cape Cod sight
Colorado's Great ___ Dunes
Contents of a playground box
Kind of bar or bank
Take the edge off?
SAND as a noun:
1. a loose material consisting of grains of rock or coral
2. (Sand, George Sand, Amandine Aurore Lucie Dupin, Baroness Dudevant) = French writer known for works concerning women's rights and independence (1804-1876)
3. (backbone, grit, guts, moxie, sand, gumption) = fortitude and determination; "he didn't have the guts to try it"
SAND as a verb:
1. (sandpaper, sand) = rub with sandpaper; "sandpaper the wooden surface"