Friday’s solutions:

Across: 6 Surfeit. 7 Motor. 9 Alter. 10 Resound. 12 Demonstrate. 14 Fruitlessly. 18 Compact. 19 Strew. 21 Frock. 22 Phantom. Down: 1 Quell. 2 Effete. 3 Fit. 4 Colour. 5 Cognate. 8 Persist. 11 Collect. 13 Armoury. 15 Impact. 16 Latent. 17 Below. 20 Shy.