Cryptic crossword No 1,359

Across

1. Relating to citizens 104 and 99 (5)
2. McCarthy or Stalin's type of 6 down? (3)
3. Lick about 500 sheets of paper (5)
4. Finnish cocktail for a supporter of Stalin (7)
5. Replenishes umpire with troubles (7)
6. Solo sailor in oil-rich region (6)
7. Enthusiastically cool-headed leaders, weirdly (8)
8. Man addressed casually getting letter from abroad, attending to old type of 6 down (9)
9. Rowan's character could be magic for Jack (4)
10. Part of sword blade to the left of insect (4)
11. Catching Englishmen left out at sea (9)
12. No polar region admits gas or drug (8)
13. Remainder in river, just like that! (6)
14. 6 down maker found in boat Sir Abraham brought about (7)
15. Nice in south to wash subject (7)
16. Verbal injury prepares 6 down (5)
17. Reasonable about a tree (3)
18. Commander backing offensive musicians... (5)

Down

1. ...and losing end (or most of it), (5)
2. Galvanic Ghanaian lake I see on the radio (7)
3. Roughly, drunk boxes female - handbags at dawn! (8)
4. Jack Gardner's type of 6 down (4)
5. Small but important creature: "Attention! Worth rocking out to Motörhead!" (9)
6. Call to attract attention, very loud in place of heart: "Hot stuff!" (6)
7. Revolutionary B-Bruce Eisenhower is slippery and hard to catch (3-4)
8. Note animal enclosure is obscure (5)
9. Cup of glue overturned (3)
10. On camera, I played 6 down (9)
11. Persistently bother old horse (3)
12. Cockney chap's crowd with nothing for a 6 down (8)
13. Lights gold organ with gold from the bottom (7)
14. The moment for a type of 6 down? (7)
15. Runs drying kilns; prepares, for example, 6 down 15s (6)
16. Nail old boy to Mogul (5)
17. Above the opening, that's obvious (5)
18. Book report holding up fringe benefit (4)