Answer: leadpipecinch

AnswerCrossword Clue
LEADPIPECINCH

No-sweat job

LEADPIPECINCH

It's a sure thing

LEADPIPECINCH

Absolute certainty

LEADPIPECINCH
Absolute certainty: Slang.
LEADPIPECINCH
Sure thing
LEADPIPECINCHPlumbing operation?
LEADPIPECINCHCakewalk
LEADPIPECINCHTask so simple you can't miss