Here are the possible solutions for they fill the bill and this puzzle's theme clue
Answer
Clue
Relevancy
cents
Clue
They fill the bill (and this puzzle's theme)
Definition
CENT, a coin worth 1/100th of a dollar
fifteenthletter
Clue
Item missing in this puzzle's theme that's absent as well in the fill and clues
four
Clue
Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
