Cryptic crossword No 3,801

Across

1. Route over green regularly a source of complaint (8)
2. Not a fan of that era (5)
3. Everyone's less edgy to find one who's generally skilled (3-7)
4. Raise again, check, then fold? (10)
5. Adapting is integral to career (8)
6. Unfriendly, edging closer to the average way of behaving (9)
7. These prehistoric houses brought about disease (6)
8. Thrashes side in front of away section (5)
9. Having opposing views and ready to take on the Spanish king (9)
10. Blast rude children, losing head (4)
11. Previously connected every now and then (4)
12. Church leader's fine leaving associate in charge (6)
13. Take action to improve but it happens how I designed (4,4,5)

Down

1. Made untidy dumps seem almost ordered (6,2)
2. Make a mistake entering boundless Asian mountain range (6)
3. They were used to call tribes across South American river (8)
4. Every odd bug grew, each stripping lush greenery (7)
5. Drag along pair downing whiskey (3)
6. Knight errant can tell story from the heart (8)
7. Drunkenly sway and dance in Scotland (4)
8. Form oversight (4)
9. Apprehension as cycling was painful in the past (5)
10. Rising gas from mouth guard put on the counter (9)
11. Position artwork, making the base square (6)
12. Surviving with experience primarily rather than a degree (6)
13. Impressive display of design with gear shifting back-to-back (9)
14. Caught fire? Send water down this (5)
15. Madonna's appeal? (4,4)
16. A little evasive about age? (3)
17. Forecast advertising order (7)
18. Fruit perhaps not available, run out upset (6)