With light on, it looks silky (5)

I believe the answer is:
rayon
'it looks silky' is the definition.
The definition suggests a singular noun which matches the answer.
'with light on' is the wordplay.
'with' is a charade indicator (letters next to each other).
'light' becomes 'ray' (ray is a kind of light).
'ray'+'on' is 'RAYON'.
Can you help me to learn more?
(Other definitions for rayon that I've seen before include "Silklike material" , "Viscose fibre" , "Synthetic material" , "Synthetic fibre" , "Man-made fibre" .)
