Fresco of them Urals (5)
I believe the answer is:
mural
'fresco' is the definition.
(thesaurus)
'of them urals' is the wordplay.
'of' indicates the answer is hidden within the clue.
'MURAL' is hidden in the letters of 'them urals'.
(Other definitions for mural that I've seen before include "Wall-painting" , "Artwork" , "Painting on a wall, fresco" , "Wall art" , "Wall decoration" .)