1 Rubber maybe erasing some ink diagrams
4 Starts hiring no-one to survey no-one's herd
8 Cutback many supported
9 The extra sheet's to bury a page
11 Song about post-Christian house upset possibly half clergy
12 Aircraft eventually starts on time
14 Mimi, say, ignores the rest
15 Interview might trip one up
17 To horse, I hear! Man in the saddle's suitably dressed
18 New Deal no Presidential appellation
20 Add note to novel again
21 Corrupt EEC insider's provisional split
23 It's reversed into jail and been released
24 Excuse me wearing white to one
25 Insect consumed wholly, by the sound of it
26 Owners of these are long in the tooth, perhaps

Down

1 Solve Latin clue and smile at end of mental over-exertion
2 Fly parent with extended undercarriage
3 Sad sort sees red about letters' targets
4 Top fashion house head to freshen up act
5 Local telephone firm in during school
6 We claim Cockney ages
7 Those playing chess at three?
10 Smooth French address a bright period that's before possible developments
13 Redirect train: switch lever's nothing to do with it
16 Third power's underground sugar cane?
19 Member of nuclear group supporting Imperial measure
22 Limit advantage