Crossword Puzzle Marks up, say

Clue: Marks up, say

Author Upton ___ Sinclair (BEALL with 5 letters)
Kenyan group in a 1950s uprising (MAUMAU with 6 letters)
"The Nine ___": Sayers (TAILORS with 7 letters)
Not very high marks (CEES with 4 letters)
Some marksmen (SNIPERS with 7 letters)
Like upscale parties (DRESSY with 6 letters)
Story mapped out in this grid, from lower left to upper right (HANSELANDGRETEL with 15 letters)
Updike book (COUPLES with 7 letters)
It's got a lot of marks (SCAM with 4 letters)
Tummy upset (NAUSEA with 6 letters)