1 Some start to follow ever-changing shifts (5)
2 Following is in a clique (7)
3 Away team must meet Austria to start with (5)
4 Understand that your introductions must be cordial (6)
5 The original argument for back-stabbing? (7)
6 Holiday opportunity (5)
7 Rest's disturbed by heartless Somali relatives (7)
12 Continue going over chapter that is frilly in the extreme (7)
13 No talking as central characters from Glee come in (7)
15 Concerning an archive of Balzac, Tolstoy or Henry James, perhaps (7)
16 When wrapped around lard stuffing, venison becomes sweeter (6)
18 A touching overture to revoultionary tune (Chambers) (5)
19 Tough and sticky ending for the man who gave us Tess (5)
20 Blushes in the middle of electro sessions (5)