Cryptic crossword No 3,226

Across

1. Took stock of degraded metal on electric light (7)
2. Cut down importing uranium, given source of energy (7)
3. What's said before "alive" or "dead" by giant? (Atlas or Hercules perhaps, definitely a big one!) (8)
4. Shake alien spacecraft (6)
5. American bird (4)
6. He's straight away getting rid of polar opposites seen together, keeping the others with some reluctance? (10)
7. Playful film with Jodie Foster, in general directing a particular way (10)
8. Hearts in diamonds in 500 appearing later for those without faith (8)
9. Able to run here in Italy when wearing cap (6)
10. Let no race be abused by this principle? (9)
11. Reminders of ongoing trauma, mostly about thrashing (7)
12. Web of Life on Earth, comfortable root (9)
13. Role-reversal gig (4)
14. Concerned with non-drinker taking the piss in 18 down content passed on (7)
15. Can reverse, for example, overindulgence (5)
16. Lump in the throat with a love briefly turning back (5)

Down

1. In retro music, 'I' note? (5)
2. Fellows cast in molten steel, iron and 6 perhaps (8)
3. It drives users to restrict cable length in factory (10)
4. After China's year to 12/2/1926, finally drawing in Japanese money - it was used in 23 form in 1 20's 11 of 16/3/1926 (6)
5. Group in depot pour richer mixture (9)
6. One way or another, therefore, expressions of Lisa's indifference and Bart's pain (7)
7. Relieved of load in bed, run nude all around (10)
8. Takes to task, arresting a pair of fellows for the gallows perhaps (9)
9. What Icarus got wrong with mental approach the first time, becoming fatal ultimately (8)
10. Nitwit terminally got hold of it, and now it's labelled 'X' (7)
11. Favourite job? Mostly being 5 down in 1 20's 11 of 16/3/1926! (6)
12. Finally, engineer to grab 17 for 11, though doing so 23-29, a pioneer indeed! (6,1,7)
13. See 1dn
14. Pines perhaps to lose last of beginner supports (4)
15. Customary victory eluding unfortunate 27s (5)
16. Part of tree often eaten in insect's cycle (4)