Secret or Hidden Way in or Out of a Building
This page is the CodyCross answer for the clue below from Train Travel, Group 713, Puzzle 1 (Engineer and Conductor).
Question is: Secret or Hidden Way in or Out of a Building
and the answer is: BACKDOOR
Word Meaning:
BACK DOOR — A subsidiary entrance to a building or house at its rear, normally away from the street.
Definitions from Wiktionary.