Cryptic crossword No 3,727

Across

1. Officer in charge leads North America's eight-branching marine body? (7)
2. Hot streak of butter? (2,1,4)
3. Scholar neglecting human resources gets operation quarry to synthesize mind-altering chemical (11)
4. Lower-class power flows through you after street divided by union boss leaders? (7)
5. Spooner's tea division produces data visualization (3,5)
6. Male chromosome with lithium cluster returned artificial sweetener (7)
7. Initial resistance removed in error following electromagnetic pulse, reveals Naruhito, among others (7)
8. Jack Sparrow's actor retired after a French star lacking boundaries displays virgin (8)
9. Association of devotees wave strike (3,4)
10. Nozzle emitting no white secretion rings tests one's intelligence? (7)
11. Oral philosophy explaining evil rejects article, evokes hero's journey (7)
12. Greta has the essence of elegance radiating foremost - precious in the auditorium (5)
13. Local area network chiefs adopt uniform electrical capacitance pertaining to writer of acts? (5)

Down

1. Twigs gathered for river flowing towards final delta? (4)
2. Fifty saw cops getting cabbage salad (4)
3. Switch on the phone - interfere (4,2)
4. Public relations surround mysterious opal tree (6)
5. Men's conceptions shelter this? (8)
6. "Once each winter?" "Yes, Marly, without service mark originals" (6)
7. New York mile bombarded with surrounding nerves (6)
8. Roman virgins enable a lighting primarily (6)
9. Celebrity photographers replace standard area with Los Angeles hotels overshadowing Venice Beach? (7)
10. World's greatest weight-loss drug substitutes onsets of long yawning for unknown energy (7)
11. Periodically ransack Otto to get Windsor keeper? (5)
12. Periodically, Gary plays around and fathers fathers? (8)
13. Arrive outside Embers with uniform but no early ecstasy? Awkward (10)
14. Giraffe ditching India, lowering queen to ground to find king? (6)
15. Young girl supports constant elegance (5)
16. Scotsman infiltrating Post Office because Tillyfourie unloaded key instrument (10)