Crossword Genius

Help artist upset in piece for newspaper (8)

Ross

I believe the answer is:

guardian

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'newspaper' is the definition.
(UK newspaper)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for guardian that I've seen before include "Champion - paper" , "One in loco parentis" , "Protector or watchful angel" , "Caretaker" , "Platonic leader" .)

I've seen this clue in The Independent.
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