Cryptic Clues

ACROSS
1 This influential linguist is so certain by the sound of it (8)
5 Self-control of office worker returns again (6)
9 Write about pater dressed as a fictional character (5,3)
10 Catalogued in '51 on Ted's order (6)
11 Shrub opening before Hero's lover (8)
12 Letters from apostle reassured old stable lad (6)
14 Ought the king to order a bit of supper for those without commissions (5,5)
18 Bands of singers near long part of the church (5,5)
22 Are tin fragments in part of the eye? (6)
23 Drunk irate after prison - upset by language (8)
24 Harm is done by this inventor (6)
25 Make known when girl put on weight (8)
26 Unfortunately these involve a follower in a Greek city (6)
27 Hearing railwaymen come back for rehearsal (5,3)


DOWN
1 Draw off and drink small quantities with Henry before working (6)
2 Not fastened with a Fench knot today (6)
3 Beginning well (6)
4 Lear's nonsense about English gallery's land (4,6)
6 Diplomatic representative in England to avoid Ray somehow (8)
7 Cannabis? (3,5)
8 Relief organization's symbol makes Socialist angry (3,5)
13 Lake District athlete collapsed in front of messenger (4-6)
15 Man inside where the filming takes place with the first Miss O'Hara (8)
16 Philosopher, it's reported, to leap over river (8)
17 Devious con to produce false incriminating evidence about former jockey (8)
19 Girl carrying on in this city (6)
20 Leather worker gets sixpence (6)
21 George in victory gets a duck (6)