The light ahead is an artificial product (5)
I believe the answer is:
rayon
'an artificial product' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'the light ahead' is the wordplay.
'the light' becomes 'ray' (ray is a kind of light).
'ahead' becomes 'on' (synonyms).
'ray'+'on'='RAYON'
'is' is the link.
Can you help me to learn more?
(Other definitions for rayon that I've seen before include "Synthetic silk-like fabric" , "Man-made fibre" , "Viscose fabric" , "Imitation silk" , "Man-made fabric" .)