Cryptic crossword - The Scotsman 27/04/15

ACROSS

1 A head boy not getting in; suggest he will have to step down (8)

5 Refuse to argue against 4 down (6)

9 Hold back the others, taking artist in ... (8)

10 ... and artist arrived first at a private chamber (6)

12 Arranged to start game with a manoeuvre (9)

13 Have to carry leading man as a 16 down (5)

14 Find an agency in a Post Office branch (6)

17 Trees have little time to grow to the top (5)

20 Right away, a 8 down could become a real nuisance (5)

21 Struggle to be offensive in the campaign (6)

24 Left popular Queen with some mascara (5)

25 They use workers, having right to replace last one (9)

28 Say first godson encourages them (4,2)

29 Record holder can be put in order (8)

30 At the first house, spots a party, commonly (6)

31 Risks opening up? Sure (8)

DOWN

1 Check a first-rate balance (6)

2 Want to reside in new development (6)

3 Root vegetable, we’re told, carried little weight (5)

4 Object to getting watered-down gruel, at the start (5)

6 Did attractive boyfriend turn into lift-off? (9)

7 They will make the mark of the Cross next week (8)

8 Twice met up with a close associate (4-4)

11 Will the whole lot come to a peak? (6)

15 Sleeping pets are less likely to win (9)

16 Some may resemble magic symbol (6)

18 A glib fellow, with promotion, could be well off (8)

19 Brewed up some green tea for an adolescent (8)

22 Grant had most of the semester as a tenant (6)

23 Judge a 24 across over European one (6)

26 Charger in the final troop, at the end of the day (5)

27 Start working, ready to finish (5