Airy torch, for one (5)
I believe the answer is:
light
This clue is a double definition.
'airy' is the first definition.
(synonyms)
'torch for one' is the second definition.
(I know that flashlight is a type of portable light source)
(Other definitions for light that I've seen before include "Person of authority" , "Frivolous -- insubstantial" , "weighing relatively little" , "Beam" , "guide in the dark" .)