Band that is excluded previously has gone platinum (3-5)

I believe the answer is:

ash-blond

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'band that is excluded previously' is the definition.
The definition suggests a singular noun which matches the answer.

'has gone platinum' is the wordplay.
I cannot really see how this works, but
an anagram of 'has' is 'ash' which is present in the answer.
The remaining letters 'blond' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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