Don could be a master of these (4)

I believe the answer is:

arts

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'don' is the definition.
Although both the answer and definition are singular nouns, I cannot 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 arts that I've seen before include "Drawing, painting, etc" , "Humanities" , "Products of human creativity" , "Aesthetic creations for a star" , "Poetry, music, painting etc." .)

I've seen this clue in The Irish Independent.

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