Cryptic crossword

ACROSS

1 Dog seen roaming plains around the east (7)

5 Array, one might say, on the side (5)

11 Romantic involvements inside the Home Office? (8,7)

12 I dare you to make up to wartime guard (4)

13 Undercover agents of secret police consume pastry (5)

14 Thanks firm for delivering Mexican food (4)

17 Agrees to get mixed up in something sticky (6)

18 Pushes slopper out (7)

20 Birds have - at first - plenty of boyfriends (7)

22 Thus in first degrees one is enjoined to go back to these (6)

24 No Sunday opening at National Gallery (4)

25 Put up with burn (5)

26 Food for Australian aborigine, perhaps (4)

29 Unsuspecting sojourners finding free place in hostelry on a minor route (9,6)

30 See me overturned in its articles (5)

31 Twist Italian in book, for example (7)

DOWN

2 Blunder into something hazardous on the ground, perhaps (3,4,4,2,2)

3 Trainspotter seen in place for limited ends (4)

4 Something to learn from used to be enough (7)

6 Strike tail off bear (4)

7 Orient mad cat on a scene of mayhem - Tom and Jerry, for instance (8,7)

8 Lead Heather to love language (5)

9 Confront - and back down (4,2)

10 Patronise psychic on river (7)

15 Sheep-pig left in tower (5)

16 It's fair to conceal nothing in contest (5)

19 Arrange to put sink in spacecraft (7)

21 Desert on beach (6)

22 Foliage feeder seen by Explorer, say (7)

23 Sailor was in debt, we hear, at home (5)

27 Scotsmen are a pushover for fraud (4)

28 Help to settle a wager (4)