1: Broke out of cell -- found in prickly sedges (5)
2: Bend in the middle and wind back (3)
3: Half disapprove of old king (3)
4: Final recipient of product ensured indiscreetly. (3, 4)
5: California owl sounds like being in a partnership of sorts? (7)
6: Still drunk, sings in a light, rhythmic way (5)
7: Disturbed intruder, pet disturbed. (11)
8: Cad mad about Dutch port (9)
12: Hang back, keeping right next to person buying a jumper (11)
13: Solo, the pilot rises? No way (3)
15: More than one grown-up kids' tender hearts god broke? (9)
18: Responds to a state with a royal bearing (7)
19: Fancied whos coming to dinner, we hear (7)
20: Right, turn right to play with robot (3)
22: Outspoken one-time Houston gridiron pro and mathematician (5)
24: Bridge players under low deer (5)
27: Clothilda is carrying a parcel (3)
28: Man, what an avant-garde US artist! (3)