Coffee Break Cryptic

18 April

Across

1 To expel Open University student leaders ... (4)
3 ... head of college awoke and went on a spree (8)
9 Mayall's daddy coming round for spice (7)
10 Source of spirits even now (5)
11 Traps set out for a little fish (5)
12 Wonderland character who is mad about 18 (6)
14 Comment about evangelist (6)
16 Some critic and leading light (6)
19 One hug may be sufficient (6)
21 Throw black stuff (5)
24 Bill gets free bitter (5)
25 Joy has cracked toenail (7)
26 Learned to repeat after listening first (8)
27 Expression of regret for a girl not finishing (4)

Down

1 They are not in favour of work with difficult puzzles (8)
2 Jolly good little police officer (5)
4 A personal assistant gets over your indifference (6)
5 Attached to group in the beginning (5)
6 Money paid when pits are about to close (7)
7 Depression concealed by Brenda Lee (4)
8 A workman in better condition (6)
13 One fluid in another, it seems to me (8)
15 A tower is encountered and the rajah's wife is held up (7)
17 Show up with a paper model (6)
18 Warning that restrains sappers (6)
20 Foreign articles below (5)
22 Hearing affliction (5)
23 Armour in the post (4)