Cryptic crossword No 1,568

Across

1. They march backwards? Poor, in a way (6)
2. Lee: bad, incoherent minor functionary (6)
3. Damage caused by what's at the extreme end of the spectrum (7)
4. Fatuous slogan - "Bash small animals!" says one who talks of fighting liars (4,3,5)
5. Maliciously misguided leaders of party insist "Let us fly!" (10)
6. Depressed Prime Minister suffering a loss (4)
7. A range of hearing (5)
8. Convey it's time we organised bringing some officials back (8)
9. Partners' pink backs? That's monstrous (8)
10. See 9
11. A replacement as I leave Ms Harding going up the wall (4)
12. Supplying partial evisceration, frequently "for the British people"? (10)
13. Cummings, say? "One that divides? Not I!" (7)
14. Screech "It's essential Zulus are dead!" (7)
15. To cause festering row with the French (6)
16. Irritable, heartless Tory embraces cut (6)

Down

1. An unscrupulous demagogue leading in Truss' seat (5)
2. Keeps going round, with nothing avoiding a judge (7)
3. Responsibility shouldered, as Roosevelt did according to Spooner (9)
4. Record brazen effrontery missing special offer (5)
5. Gets rid of snide pose Sunak’s holding (7)
6. When half-unscrupulous people (not Conservative) are those who call attention to others' good qualities (9)
7. Paul's left cooked helpings of food (9)
8. Boris really was Great (9)
9. French town where to take Ecstasy and get high is believable (9)
10. Corrupt onanite schooled near Slough (7)
11. At first, occasionally carry 50? 99? It's material (7)
12. "Peer upholds nothing". Drivel (5)
13. "Has balls" but is bonkers (5)