2366: The square
Three items (one consisting of three words, and two consisting of four words each) read clockwise round the perimeter. Part of their source’s name is given by a light clued without definition; the rest (two words, rendering the 13 in 30) is concealed in one row and should be highlighted. Ignore an accent. Letters in corner squares and those adjacent to them could make SHORTER STUDY. Across 11 Ordinary church long ago (5, two words) 12 Actually, left out, back in tent (4) 14 Concession by queen for singers (7) 15 Suffering, receiving mixture of nectar and medicinal substance (10) 17 Ghastly, stupid man,
