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

Crossword clues for Secret signal 4 letters:

CODE: Secret signal system.
PSST: Secret signal
CODE: Secret signal
RECODE: Change secret signals
PHEROMONE: Secreted signal
EAR: It might be pulled in a secret signal
GIVETHEHIGHSIGN: Warn with a secret signal
CODES: Secret signals.
MOROSECODE: Secret signals of gloom?