Crossword Genius

What a wire tapper uses? (5,4)

Ross

I believe the answer is:

morse code

(Other definitions for morse code that I've seen before include "Way of signalling" , "Dot-dash signalling" , "Means to communicate" , "Signalling system of dots and dashes" , "Means of communication using dots and dashes" .)

I've seen this clue in the Universal.
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