Cryptic crossword No 3,409

Across

1. Excited about a small bet (8)
2. Working out squat's existing arrangement (6,3)
3. Reduces the number of cattle (6)
4. Fringe members of council impugn idiosyncratic healthcare facility  (6)
5. Some galumphing oaf (4)
6. Spot nursery's head and volunteers getting something to feed babies with (8)
7. Show appreciation for swamp of publicity? (6)
8. Eat when the hot drinks are served (3,5)
9. DJs, for example, mumble extremely stupid answer (8)
10. Those finishing this may join staunch organisation (6)
11. Ostentatious items of women's underwear, extremely silky (6)
12. Dare Romeo to fly around airfield (9)
13. A key defect somehow modified (8)
14. Shrink's lecture is dictated (6)
15. If visitor centre gets overrun by ivy, perhaps that's more ominous (8)
16. Heartthrob is not working by the sound of it (4)

Down

1. A fresh mixture of universal additives (5)
2. Common owl flying around summit (7)
3. Arm bones found periodically in fuel intake (5)
4. Question dizzy aunt with hesitation? Just a little bit! (7)
5. Something for breakfast produced without alarm being set off (9)
6. Roll of notes?  (5)
7. It brings down blushing with unusual cure (7)
8. Wash hair with this artificial crap?  (7)
9. Fabric moved back and forth noisily (5)
10. Care if top gets pulled down a bit in sale (7)
11. Quit area of expertise? That's weird! (4-5)
12. Complicated plan is to include lead from Impressionist artist's medium  (3,6)
13. Sicilian city gets to a state of near paralysis  (9)
14. Implement silent treatment after you called out  (7)