Wall painting (6)
'wall painting' is the definition.
(frescos are usually painted on walls)
This is the entire clue.
(Other definitions for fresco that I've seen before include "Picture painted on wall or ceiling before plaster is dry" , "Method of painting on walls" , "Forces (anag) - wall painting" , "Artwork" , "Wall-painting" .)
'wall painting' is the definition.
(synonyms)
This is all the clue.
(Other definitions for mural that I've seen before include "Wall-painting" , "Drawing on a wall" , "Wall art" , "Artwork" , "Painting on a wall, fresco" .)