Answer:

successor

Answer	Crossword Clue
SUCCESSOR	Augustus, to Julius Caesar
SUCCESSOR	One who follows
SUCCESSOR	Truman, to Roosevelt

SUCCESSOR	Johnston to Valentine.
SUCCESSOR	Eisenhower to Truman.
SUCCESSOR	Heir.

Crossword

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