Crossword Puzzle Makes less taut

Clue: Makes less taut

Makes taut (TAKESUPTHESLACK with 15 letters)
Makes jaws drop (WOWS with 4 letters)
Makes acrimonious (SOURS with 5 letters)
Makes an unsound decision about? (MUTES with 5 letters)
Salary that the average crossword constructor makes annually, give or take, mostly take (BILLIONS with 8 letters)
Makeshift ballot holder, maybe (HAT with 3 letters)
One who makes a will (TESTATOR with 8 letters)
It makes you think (POSER with 5 letters)
Makes a call (e.g. DIALS with 5 letters)
Lessener (ABATER with 6 letters)