Answer:

swearer

Answer	Crossword Clue
SWEARER	Oath taker
SWEARER	One about to testify
SWEARER	One on the stand

SWEARER	Court witness, e.g.
SWEARER	One taking an oath
SWEARER	Oath-taker.
SWEARER	Witness at court
SWEARER	One under oath
SWEARER	Inauguration participant
SWEARER	Oath-taker
SWEARER	One calling foul?

SWEARER	Vowing one

Crossword

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