Odorless gas (6)
'odorless gas' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ethane that I've seen before include "Chemical" , "Athene (anag.); a colourless gas" , "Flammable gas; eat hen (anagram)" , "Fuel" , "Compound" .)
'odorless gas' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for radon that I've seen before include "Naturally occurring inert gas" , "gets no reaction" , "Gaseous element, Rn" , "Rare noble gas" , "A radioactive gas, symbol Rn" .)