ARTNOUVEAU

French school of painting and architecture of the 1880s (3,7)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 15,654 — 2020-07-08 23:00:45
  5D: Design style used by Charles Rennie Mackintosh, say (3,7)
• Quick crossword No 15,311 — 2019-06-03 23:00:17
  10A: French school of painting and architecture of the 1880s (3,7)