1: How US driver is making good progress? (2,3,5,5)
4: Couple in forest endangers all the wild (6,3,6)
8: In fear of wheat head (3)
9: Hang back, keeping right next to person buying a jumper (11)
13: Lasso a large animal, making first off for north (5)
14: Bitter expert with broken crib (7)
15: Wild game cooking in ovens (7)
18: Piece of wisdom from a quiet aristocrat (5)
19: Exciting moment, actor as reviewer (11)
20: Sixpence for big cheese? (1.1.1.)
22: Risk solemn query about primates (8,7)
25: Answer to shop-hands offer of marriage? (7-8)