Crossword Genius

Supplier of commemorative mugs? (8,7)

Ross

I believe the answer is:

portrait painter

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'supplier of commemorative mugs?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is the entire clue.

Can you help me to learn more?

(Another definition for portrait painter that I've seen is " Artist".)

I've seen this clue in The Independent.
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