Gas, from zero, turned back beyond ten (5)
I believe the answer is:
xenon
'gas' is the definition.
(I've seen this before)
'zero turned back beyond ten' is the wordplay.
'zero' becomes 'none' (I've seen this before).
'turned back' says the letters should be written backwards.
'beyond' is a charade indicator (letters next to each other).
'ten' becomes 'x' (roman numeral).
'none' reversed gives 'enon'.
'enon' after 'x' is 'XENON'.
'from' acts as a link.
(Other definitions for xenon that I've seen before include "Rare gas" , "Chemical element" , "Inert gas, Xe" , "Gas used in bright lamps" , "Noble element" .)