Crosswordiee.com

% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for One might be cracked 4 letters:

CODE: A cryptographer might crack one
CODE: A spy might crack one
DOOR: One might be cracked
CODE: One might be cracked
SMILE: You might crack one while playing
SMILE: One might be cracked
HAG: One who might crack a mirror
NUT: One might be tough to crack