Crossword Clue:

that cannot be let

AnswerCrossword Clue
INDELIBLEThat cannot be forgotten
TRESSLock that cannot be opened
DRAFTCall to arms (that cannot be denied).
LESSONTO"Let that be a ... you"
TOIT"Let that be an end ..!"
HEMSomething that may be let out
LESSON"Let that be a ... to you"
OBAMA"Let us reach for the world that ought to be." (2009)
OTISCompany that would be crazy to use the slogan "We never let you down"?