Answer:

reining

Answer	Crossword Clue
REINING	Checking with the bridle.
REINING	Pulling certain strings
REINING	Slowing a horse, with "in"

REINING	Holding back, with "in"
REINING	Keeping under control
REINING	Holding in check

Crossword

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