Crossword Genius

Given a medal, having wallpapered (9)

Ross

I believe the answer is:

decorated

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'wallpapered' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for decorated that I've seen before include "Gothic style following 6 8" , "Ornate" , "Embellished" , "Adorned, bedecked" , "like a warrior?" .)

I've seen this clue in The Mirror.
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