Cryptic crossword - The Scotsman 17/12/14

ACROSS

1 Derrick, eccentric going round Ohio or another man (8)

5 Fasten most of case (6)

10 Scottish essayist from English city, we hear (7)

11 Endlessly greeting riotous number (7)

12 Unofficial receiver (5)

13 Accept a card, be encouraged (4,5)

14 Where pupil sits and is educated? (4,2,8)

17 Rendering given by translator (14)

21 Said new promise, Edward denied knowledge of it (9)

23 Nothing charged for fruit (5)

24 One improving his mind coming from fireside losing direction (7)

25 State a master followed a novice and sailor (7)

26 Row back from southern Ireland southwards (6)

27 Protective boarding used to see night out (8)

DOWN

1 Fierce resort in Brazil (6)

2 Throw into confusion having called in most of the ruminants (7)

3 Sounds the same at the end three times by would-be poet (9)

4 Furniture, large box belonging to artists? (5,2,7)

6 Small person or small bird on small church (5)

7 Asian hound I dogged (7)

8 Eight are bothered with inheritance (8)

9 How one was fatally affected, having a light touch (7,2,5)

15 Logical point of reasoning (9)

16 Benevolence of Dennis cavorting in Kansas (8)

18 Thanks good man that is right, it is more appetising (7)

19 Round sails and tackle, French friend does some paper-folding (7)

20 Malaysian lawyer? (6)

22 During salvo I ceased being a singer (5)