5  Fictional namekian, irrational-cool otherwise, acknowledges a bit of cowardice (7)

 9  True-blue noble switches sides (5)

10 Claim Master's butt (9)

11 Old-man-in-the-spring ogled nurse, perhaps endlessly (9)

12 Peacekeeper's endless fight is too much! (5)

13 Regular theory? most partner with conditions (5)

15 Bird of Burden? (9)

18 Reverend declared, "sentimentality dear, is a bribe!" (4,5)

19 Finally retire from a resort, still a city- one of the regions within Crimea (5)

21 Glad, Ephraim refused to hide a bicycle part (5)

23 Traveling in train, for a change with time and energy (9)

25 It's ok? Model's nude- bad tempered! (4-5)

26 To, Barbie's beau- a keepsake (5)

27 Malicious mail managed to bounce back in sheet form (7)

28 Element of animal force (7)

 1  Fair to capture Chapo, say, to strike another match (7)

 2  New York based blacks and whites? (9)

 3  Kind of material, for long kept wrapped (5)

 4  Frown! Gasp! Jumping tadpoles in the making? (9)

 5  Strip jury (5)

 6  Portly cur butchered crookedly (9)

 7  Leaders of Ogilvy&Ogilvy hosted excellent dinner and expressed pleasure (5)

 8  Harmless hawks, so positioned heard to invoke a bit of sunshine (7)

14 Spoilt specimens ground spices with this halfwit (9)

16 Two in Baroda, say get marriage settlement, missing line to the oriel (3,6)

17 Knit a lore about a Liberian vessel? (3,6)

18 That man accepts work, almost sated and bullish (7)

20 All and none, examples of not many in other words (7)

22 Extracted from the east, it's sometimes sold ripped (5)

23 Cherished dinnerware, essentially (5)

24 Rave about late payment reduced towards the end (5)