Cryptic crossword No 2,535

Across

1. European typing a composition about an ancient civilization (8)
2. Short amusing retired parliamentarian (4)
3. Maybe issue of sister endlessly seeing Charlie is complicated (6)
4. Ken's outside with unlimited beer for a bender (4)
5. Exaggerated issue about church elder's leader identifying ancient silver coins (8)
6. Take for granted when birds are returning (6)
7. Car manufacturer admitted nothing in article, journalist openly stated (6)
8. Get on boat having brief interval in place of quiet (5)
9. Perhaps Birmingham University embarrassed dependable friend (8)
10. Composer is healthy cycling Romeo (5)
11. Mysterious informer changing note for daughter (4)
12. Hollow laptop (4)
13. Condemn low density backing (4)
14. Islander stood for election after day harbouring indecision (8)
15. Working in outskirts of Paisley for £25 (4)
16. Heard former young layabout entered new employment; starts becoming solvent (6)
17. Mac's recipe isn't commonly including 60% cocoa (8)
18. Showing off, call about party after introduction to Penny (8)

Down

1. Some arrive near Split (5)
2. Soil 71% of leather pants (5)
3. Instrument caught endless sound familiar to Cockneys (7)
4. Drop honour in delicate alternative to conflict (9)
5. Mean temperature in grass yard (6)
6. Cycling conditions initially terrible for one setting out with purpose (7)
7. Musician, rapper and tenor carried by Prime Minister across the pond (9)
8. Feel disturbed without church vessel (3)
9. Country with gold and radium (7)
10. Slowly climbing up volcano with inherent characteristics (7)
11. Sweet Last of the Summer Wine character followed by you French (7)
12. "Leftover rum" bishops say, with hint of tartness (7)
13. Male rising journalist holding papers about large corporation (6)
14. Last letter from representative of resistance unit (5)
15. Cut short iTunes Madness release (5)