ACROSS
1 overbear
5 stymie
9 antelope
10 course
11 neck or nothing
14 extra
15 remission
17 marmalade
19 lapse
21 cry blue murder
24 lean-to
25 break out
26 iodine
27 redstart
DOWN
1 oral
2 extinct
3 balaclava
4 appropriate
6 trout
7 martini
8 emergences
12 nom de guerre
13 vermicelli
16 salad days
18 reynard
20 pergola
22 let on
23 at it