Sorry folks need help this week to finish it!
4a "drive in a cleaner city" 6 letters ?????d
9a "designer, say, making a team lean" 7 letters ?t???s?
18a"'hadty retreat protects American soldier" 6 letters h???a?
24a "returning sweet Norse literature made sense" 7 letters a?????p
Hope you can help. Frustrate