Answer: GHOST
The answer GHOST has 192 possible clues. See the results below.
Possible Clues:
- Casper, famously
- Marley's, for one
- Common Halloween costume
- Any of four that chase Pac-Man
- Spirit shown by grand army
- Word game ... or a word that can precede the starts of 18-, 26-, 43- and 54-Across
- Lay down life for another in this spirit
- Supernatural apparition
- Many people following good suggestion
- See 7 down