Complete amateur (11)

I believe the answer is:

unqualified

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This clue might be a double definition.

'complete' is the first definition.
(thesaurus)

'amateur' is the second definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Another definition for unqualified that I've seen is " Absolute - lacking requirements".)

I've seen this clue in The Telegraph.

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