It's never made the charts (8)

I believe the answer is:

unmapped

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'made the charts' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives sometimes mean the same thing.

I don't understand the remainder of the clue.

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(Another definition for unmapped that I've seen is " Yet to be charted".)

I've seen this clue in The Globe and Mail.

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