Cryptic crossword
ACROSS
1 Crack infantry travel as fast as possible (7)
5 Surprised sailor with split in anti-aircraft fire (5)
11 Terry, eg, has the sense to come to loch with one having vital information in case (8,7)
12 I desert head cook (4)
13 Make a profit once more (5)
14 Thus measurement of work is zero (4)
17 Unsettled sniper becomes ready for action (6)
18 Learner to dust off books about Edward the First (7)
20 Spartan before getting to southern continent (7)
22 Old king takes up man and wife (6)
24 Hang about to hear the patter of tiny feet, perhaps (4)
25 Duck to put another duck in stall (5)
26 Comic one-legged entrant is hero of the moment (4)
29 Call up for race before start of point (8,7)
30 One encouraging first bite to be taken from meaty bun (5)
31 Amaze with a noise that goes all round the square (7)
DOWN
2 Best quality prepared after white frost (2,3,5,5)
3 Steady company (4)
4 Fruit, but literally not the only sort (7)
6 Moderate temptation, we hear (4)
7 What Narcissus saw with obvious imputation (5,10)
8 Initially starting to laugh at old-fashioned dress (5)
9 Beaus and birds I'm introduced to (6)
10 Accompanies in other sectors (7)
15 Put off turning up with what 23 needs to be (5)
16 Predict spending month at old city (5)
19 Rage about a member getting up on hind legs (7)
21 Catch parent in corrupt deal (6)
22 Picks French things containing egg (7)
23 International law-enforcement agent is hungry (5)
27 A certain spy chief removed from Great War battle scene (4)
28 Musical group to accept religious instruction (4)