2: Picture a dessert without topping (3)

4: Cry at nothing and hope to be only slightly cowardly? (9)

7: Rohmer hiding unit of Resistance (3)

8: Thumb Drum? (3)

9: Starts to read each chapter after pausing for review (5)

11: End of Oslo peace process making things less clear (13)

14: Sing gist of laudatory ode loudly (5)

16: Some wear medals when carrying weapons (5)

17: Requires five kills, or a single accurate shot. (3)

18: Start reducing salt? (3)

19: Humphrey's one over par (5)

21: Ensemble originally formed with ocarina, cello, theremin, euphonium, and tabla (5)

22: Beat it and ran, for example, with Girl Scout ingredients (9,4)

23: Splay out and make tremble (5)

24: Polygraph unexpectedly traps vandal (3)

26: Residue has scattered (3)

27: Busted on a journey destined for the Orient (9)

28: Perfect counter-spy equipment (3)

1: Snap since Scots embrace the proposition to benefit from exposure to the sun. (15)

2: Direct object (3)

3: Worthless even when recycled (3)

4: Root for mounting might (3)

5: One politician's a brat (3)

6: She sails for Elizabeth (3,8,4)

9: Kingdom seen in nature, almost (5)

10: Formative years of Julia and Robin (9)

12: Bigoted, ideological extremes in preamble to bill are misguided (9)

13: He's not joking, it's completely lawless. (2, 3)

15: Turns violin over to get pointers? (5)

20: Attack set up by funny-looking little green man (5)

23: Infection leads from partly uncooked steak (3)

24: Concealed hot part of psyche (3)

25: Capture perfect score in review (3)

26: Venomous enemy lurks in Caspians (3)