One who's compulsively creative? (5)

I believe the answer is:

maker

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'one' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for maker that I've seen before include "One who creates or constructs" , "Producer" , "Creator" , "Fabricator; poet (arch.)" , "God Almighty" .)

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