Crossword Genius

Words or drawings sprayed on walls (8)

Ross

I believe the answer is:

graffiti

(Other definitions for graffiti that I've seen before include "Unwanted writing in public places" , "Alfresco wall art" , "Unauthorised public writing" , "Mural artwork" , "Unauthorised public writings" .)

I've seen this clue in The Mirror.
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