Answer: lockin

AnswerCrossword Clue
LOCKIN

Guarantee, as a loan rate

LOCKIN

Finalize, as a Final Jeopardy! wager

LOCKIN

Commit unalterably

LOCKIN
Guarantee, as a mortgage rate
LOCKIN
Encage: 2 wds.
LOCKINMake permanent
LOCKINEnsure
LOCKINFix permanently, as an interest rate