Young lad did trap an alternative format (9)

I believe the answer is:

dandiprat

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'alternative format' is the definition.
The definition suggests a singular noun which matches the answer.

'young lad did trap an' is the wordplay.
'did trap an' can be anagrammed to 'DANDIPRAT'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Another definition for dandiprat that I've seen is " Insignificant person".)

I've seen this clue in the Sydney Morning Herald.

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