What does the cryptic crossword clue "Communications device to signal unwittingly (9)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Communications device to signal unwittingly (9)

Times Cryptic #27162 | 3 Down | 2018-10-06 flower

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Telegraph #29521 (2020-11-14)