Help would be appreciated with the last clue: 21D Philosophical doctrine stating that there is no real difference between physical or mental conditions (6) K?N?S?
Would appreciate help with the last 3 clues: 7A Plant fluid from old times (5) ?A?E? 13D Trait of German writer, potential miser (9) ???N?R?S? 14A A menacing welder bamboozled by Miss Marple on TV...
Grateful thanks for any help with the last two clues. 6D Gardener's son pruned poplar tree (4) A?E? (Could this be acer - though acer is a maple?) 16D Small sticker advertising English country...