Door Mechanism Opened by Key; a Stalled Situation

This page is the CodyCross answer for the clue below from Casino, Group 270, Puzzle 4 (Harry Kavakas).

Question is: Door Mechanism Opened by Key; a Stalled Situation

and the answer is: DEADLOCK

Word Meaning:

DEADLOCK — A standstill resulting from the opposition of two evenly matched forces; a stalemate or impasse.

Definitions from Wiktionary.