L S , painter whose works include 1948's The Old House, Grove Street, Salford (5)
I believe the answer is:
lowry
(Other definitions for lowry that I've seen before include "Painter of industrial Lancashire" , "Painter noted for his matchstick figures" , "L. S. --, English painter" , "'English painter, famous for his stick people (5)'" , "L. S. -, English artist" .)