Answer: backdoor

AnswerCrossword Clue
BACKDOOR

Rear entrance

BACKDOOR

Portal to a patio, perhaps

BACKDOOR

Way out

BACKDOOR
Way out, at times
BACKDOOR
Indirect means or way.
BACKDOORSurreptitious.
BACKDOORClandestine
BACKDOORTryster's escape route, maybe