Gas that lowers your voice when inhaled (5)

I believe the answer is:

xenon

(Other definitions for xenon that I've seen before include "Gas used in bright lamps" , "Heavy gaseous element" , "Gaseous element, Xe" , "Heavy, colourless and odourless gas" , "Inert gas used in radio valves" .)

I've seen this clue in the Universal.

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