1 Letters pronounced “scrotum”? (7)
2 River rose flowing into pool (9)
3 Flog older brother when reported (4)
4 Unpleasant person possibly providing one with enema (6)
5 Parts of set idiomatically given like right arm (3, 5) (8)
7/9 Dealt with the recoil after American wrecking bar (5,9)
8 Make new arrangement in large tidy letters (7)
9 See 7
15 Sir Andrew's turn caught by season on bottom half (9)
18 Drummer boy with hammer: it's unusual (9)
19 One side's like the other, always retrospective policy change (8)
20 Shut up God-fearing apprentice by account arising from religious leaders (7)
22 One who gives year to the first wise man (7)
23/24 Smitten, given Olivier's heart, got husband (6,5)
25 Trump with ace, having 4:1 lead (5)
28 Clue oddly omitted middle way (4)