Painting of them Urals (5)
I believe the answer is:
mural
'painting' is the definition.
(I know that mural is a type of painting)
'of them urals' is the wordplay.
'of' indicates a hidden word.
'MURAL' can be found hidden inside 'them urals'.
(Other definitions for mural that I've seen before include "Large wall painting" , "Wall design" , "Artwork" , "Wall-painting" , "Painting on a wall, fresco" .)