Children's writer Ray in scam (6)

I believe the answer is:

crayon

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'children's writer' is the definition.
I can't judge whether this defines the answer.

'ray in scam' is the wordplay.
'in' means one lot of letters goes inside another.
'scam' becomes 'con' (both can mean a fraudulent scheme).
'ray' inserted within 'con' is 'CRAYON'.

Can you help me to learn more?

(Other definitions for crayon that I've seen before include "(Draw with) a coloured stick" , "Cyrano (anag)" , "Producer of sketch" , "Drawing-stick" , "Writer" .)

I've seen this clue in The Sun.

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