Cryptic crossword No 3,883

Across

1. Attempt to surround capital of Italy before directions given in Heracles' birthplace (6)
2. A tense fight in Roman assembly (6)
3. Governor dictator accommodating Northern European (6)
4. Emerge looking like body part on phone program (6)
5. Woman getting married accepts groom initially on river crossing (6)
6. Swiss mountain has Roman letters (8)
7. Cancel one French party (4)
8. Sanctuary where a celebrant could be found? (10)
9. Aeschylus and Sophocles, for example, act the roles of aviation pioneers (11)
10. Eternal city follows stylish case in theatre (10)
11. Assessment is no longer in the morning (4)
12. Gospel writer succeeds gospel with something to keep his place (8)
13. Stand up? Sister crumbles (6)

Down

1. Purpose? Not spending the night outside at the campsite! (6)
2. Mum unhappy with a famous rock (6)
3. Authoritarian to try weird insect (6)
4. Sporting contest involving 14? (3,5)
5. Prattle on before Stallone movie with no right - capital of Wales gets involved in famous poem (11)
6. We are told to grab her for Roman leader! (6)
7. Kapok erstwhile container for fire-tools (6)
8. Overtake amphibian which only appears every four years? (8)
9. Liquid making obscene jokes about salad dressing? (5,3)
10. Fairly excellent, very exquisite, not like yesterday (at first) (6)
11. Rig sadly ruined by holy tree (8)
12. Wail about in early Greek civilisation (6)
13. Our ape wanders around moon of Jupiter (6)