Answer:

remainder

Answer	Crossword Clue
REMAINDER	What's left
REMAINDER	The rest.
REMAINDER	Excess; overage

REMAINDER	Residuum
REMAINDER	Rest
REMAINDER	Mnemonic device about a rest (9)
REMAINDER	4, for 19 divided by 5
REMAINDER	Leftover portion
REMAINDER	Division leftover

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.