1 See 8
2 See 8
3 Good word for swallow ascending (4)
4 City copper initially needed a break (6)
5 Various types of monkey chap's involved in tricks (8)
6 See 8
7 A 'Top Gear' presenter: "When reversing, aim for problem in the mirror" (8)
8/17/29/21/26/13D/14/2/6/1 In London, W.B. Yeats, dreaming of a bee-loud glade in Ireland, associated calm with rainfall; wants relocation (1,4,5,3,2,3,3,2,2,9,3,1,5,5,5,5,2,4,3,7,4)
18 Depressing budget supermarket clown (8)
22 Sweet stuff sailor found by Birmingham landmark (6)
23 Royal Engineers soldier on land (6)
26 See 8
27 Can Penny twist? (4)