Safety guide: screen codger, so confused (5,5,4)

I believe the answer is:

green cross code

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'safety guide' is the definition.
The definition suggests a singular noun which matches the answer.

'screen codger so confused' is the wordplay.
'confused' is an anagram indicator.
'screen'+'codger'+'so'='screencodgerso'
'screencodgerso' with letters rearranged gives 'GREEN CROSS CODE'.

Can you help me to learn more?

(Another definition for green cross code that I've seen is " Set of safety rules".)

I've seen this clue in The Telegraph.

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