Cryptic crossword No 3,307

Across

1. Firm about South American plant (4)
2. Breaks away from satellite covered with impact craters (8)
3. Terrible hum aloft somewhere in Cornwall (8)
4. Eager to see more of a giant (or headless giant) in the Lord Mayor’s Show (4)
5. Right stink in toilet. Paper used before 6 came along (6)
6. Jackal is one spreading heartless mirth - yawns occasionally (3,3)
7. Firm response to error one admired in East London Times (5)
8. Weaken standard (4)
9. Murdered over nationalist insult (6)
10. Nice that after brief challenge, pound in gold taken west in American city (11)
11. Religious leader's letters from prim American (4)
12. Darby's partner shortly taking in work for plant producing cosmetics ingredients (6)
13. Spanish city's article after South Africa thrash Australia (8)
14. Criticise Pink (5)
15. With the Home Counties losing out for the present time, talk of insurrection is one more thing (8)

Down

1. Dutch side is cleaner (4)
2. Australian cut off part of river in tropical African country, moving start of gully east following legislative proposal (9)
3. Animals generally in Haifa unavoidably (5)
4. Award to city (4)
5. Bill is singing well (7)
6. Impressive array of people, largely youth leaders, following God (7)
7. Fake popular campaign in US organised raft tours (9)
8. Manual confused manic aunt too (12)
9. Single time bishop was uncomfortable, catching Greek character in toilet (12)
10. NATO ally without North America muddling along with unknown reliability (7)
11. Sense love in November with American (4)
12. Greatly impresses wife in backing plant (4)
13. Staging of old play about West Indian cricketer and presidential candidate (7)