Low clerk must change to become major US artist (8)

I believe the answer is:

rockwell

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'become major us artist' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'low clerk must change' is the wordplay.
'must change' indicates an anagram (I've seen this in other clues).
'low'+'clerk'='lowclerk'
'lowclerk' is an anagram of 'ROCKWELL'.

'to' acts as a link.

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