Crossword Genius

Promotional medium (4)

Ross

I believe the answer is:

neon

(Other definitions for neon that I've seen before include "Noble gas used in illuminated signs" , "Colourless, odourless rare gas" , "Type of lamp" , "Gaseous element, in advertising sign say" , "Type of lighting" .)

I've seen this clue in the Newsday.
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