SOLUTION TO CROSSWORD No 15,983:

ACROSS:

1 Chamber music. 8 Line-out. 9 Classic. 11 Chameleons. 12 Boss. 14 Book club. 16 Tanker. 17 Pap. 19 Refine. 21 Rattling. 24 Iota. 25 Bumper cars. 27 Shake-up. 28 Obscene. 29 User-friendly.

DOWN:

1 Centavo. 2 Adolescent. 3 Butter up. 4 Recent. 5 Ural. 6 In stock. 7 Blackberries. 10 Cash register. 13 Cauterised. 15 Bar. 18 Payphone. 20 Fat cats. 22 Inanely. 23 Jumper. 26 Veer.