Cryptic crossword No 3,970

Across

1. Supporter needs energy to get to northern hill (4)
2. Prepare anaesthetic for three, maybe (5,6)
3. Service gets one back from a long way away (4)
4. New coats for Ladies' Day here? (5)
5. Four people have a couple of pints with visitor (7)
6. Charles the Fourth struggles into mufti (7)
7. Someone taken on for for quiet support after one celebration (7)
8. Unprepared for piece of bad libel! (2,3)
9. Come back to find European copper in rivers (5)
10. Turn back into trees in city... (7)
11. ...Rennes contains a terrible trap! (7)
12. Now follows old article on best comeback of South Pacific (7)
13. I damage station’s logo (5)
14. Part-timers come back carrying one French family member (4)
15. Unfortunate clash with tribe about opening of pits in homelands (11)
16. Price of endless stock reorganisation (4)
17. I scare Mam in new train station, maybe (11)
18. Oh, not six-ply, sadly, for the man with the hammers (11)

Down

1. Turn wagon into compound (4)
2. Princess’s Australian mother? (4)
3. Made red female dean to return (7)
4. Man of the world takes break in fancy trailer (11)
5. A queen’s car runs around Dover initially to find country entertainment (6,5)
6. Raged when miners’ leader’s kept outside (7)
7. Figure in band can’t go travelling! (7)
8. Key one left inside drum (5)
9. Poem from overseas (5)
10. One’s shot inside taking back Greek character’s metal (7)
11. Now returns with subject in the wrong place (7)
12. Some veggie ate radish in diner (5)
13. Most important person captures island (4)
14. Brings great ass regularly (4)
15. Traditional distribution of income is endless (5)
16. Go into second leg, Honey (7)
17. Bring into the country once new part of roadside warning system (7,4)
18. Senses wall being destroyed by son is criminality (11)