4  Informed about student jargon (5)

 7  Initially a big cheese (3)

 9  Instruction to a new member first (6)

11 Wager on a foreign character (4)

12 Child of resonance (3)

13 Prison, also, for plunderer (7)

15 Former pupil finds poetry on the other side (7)

18 Couple of great women (3)

19 In total sobriety as well (4)

20 Smell a small fish (6)

23 Alternatively get a paddle (3)

24 Come in from barren terrain (5)

25 Bottom of drain layout (5)

 1  Flu virus at low temperature (4,7)

 2  Removal includes eggs (3)

 3  Left object illuminated (3)

 5  Moving near a venue (5)

 6  Relative may drag me North, somehow (11)

 8  Not good at needing money (4)

10 German given a French weapon (3)

13 Exclude from the pub (3)

14 Noticed something cold inside (3)

16 Call six to be seated (5)

17 Thus repeatedly average (2-2)

18 Large amount of stone (3)

21 Healthy colour in Istanbul (3)

22 Are back for a long time (3)