Guglielmo —, Italian physicist who developed radiotelegraphy (7)

I believe the answer is:

marconi

(Other definitions for marconi that I've seen before include "Developer of radio-telegraphy" , "Guglielmo -, Italian radio pioneer" , "Italian electrical engineer, d. 1937" , "Italian inventor of radio" , "Radio enthusiast" .)

I've seen this clue in The Mirror.

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