Answer: naildown

AnswerCrossword Clue
NAILDOWN

Establish conclusively

NAILDOWN

Complete, as details

NAILDOWN

Finalize

NAILDOWN
Settle once and for all
NAILDOWN
Clinch
NAILDOWNMake final
NAILDOWNSettle firmly.
NAILDOWNSettle definitely
NAILDOWNClinch, as a victory