Noble gas (5)
'noble gas' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for argon that I've seen before include "Noble gas used in light bulbs" , "Organ (anag.)" , "Chemical element" , "Inert gas in atmosphere" , "Inert eighteen ac gas" .)
'noble gas' is the definition.
(I know that radon is a type of noble gas)
This is the entire clue.
(Other definitions for radon that I've seen before include "hazardous substance" , "Naturally occurring inert gas" , "Colourless gas, atomic number 86" , "Inert gas - adorn (anag)" , "Rare noble gas" .)
'noble gas' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for neon that I've seen before include "Form of lighting" , "Noble gas used in illuminated signs" , "Colourless noble gas" , "'Chemical element, often used in lights (4)'" , "Gaseous element, in advertising sign say" .)