Light on something silky (5)

I believe the answer is:

rayon

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'something silky' is the definition.
I can't judge whether this definition defines the answer.

'light on' is the wordplay.
'light' becomes 'ray' (ray is a kind of light).
'ray'+'on'='RAYON'

Can you help me to learn more?

(Other definitions for rayon that I've seen before include "Silklike material" , "No ray (anag)" , "Material - or any (anag)" , "Man-made fabric" , "Or any (anag) -- fibre" .)

I've seen this clue in the Evening Standard.

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