Nearly half of teens turning healthy, almost drinking no alcohol (7)
I believe the answer is:
ethanol
'alcohol' is the definition.
(ethanol is a kind of alcohol)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ethanol that I've seen before include "volatile flammable substance" , "spirit" , "constituent for a dram?" , "Kind of alcohol found in Athlone" , "Ethyl alcohol" .)