Quick –

No. 16, 469

Across: 1 Canals; 4 Cosset; 9 Constellation; 10 Diocese; 11 Inter; 12 Affix; 14 Uncle; 18 Arras; 19 Avocado; 21 Hair-splitting; 22 Detest; 23 Height.

Down: 1 Cicada; 2 Nonconformist; 3 Lithe; 5 Oration; 6 Scintillating; 7 Tenure; 8 Alter; 13 Insists; 15 Washed; 16 Fault; 17 Nought; 20 Outré.