Alex's Big (mostly) Cryptic 25

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Across
  1. 1. swap the beginning & end of the English word for "Bagger"
  2. 5. fools congregate on social media (birds)
  3. 6. put the Roman numeral for one at the end and mix up roma (a further clue: New Zealand)
  4. 8. short Latin abbreviation for morning and a synonym for vegetation
  5. 9. starts with short word for felon (Verbrecher) ends with the colour of stop, the youngest Swiss in the middle
  6. 11. doctor knives & tanner (doctor = rearrange) to get a monster
  7. 13. designed to withstand high taxes (double meaning - durable and another word for a tax)
  8. 15. mix-up Marx's pal and add an "a" near the end (African)
  9. 18. use OK to build the name of a city in Asia
  10. 20. Peter Pan rhymes with jam; we have one of these trees in the garden
  11. 21. move the body and sounds like a delicious shellfish
  12. 22. does it open Asian flavours? Ali Baba & the 40 Thieves (and Sigrid uses it in the kitchen)
  13. 24. Trump misses out, "feel bitter" (und 2x gesandt auf E)
  14. 25. bring it to a close or do it to a present
Down
  1. 2. the deadline is here and time's up
  2. 3. the 1st letter of many Irish family names and the French for "Easter" - means "trüeb"
  3. 4. what goes on top of a house and in the middle of a high-pitched sound (which rhymes with "ring")
  4. 7. Ossobucco; and he wasn't hatched but rather...Ozzie!
  5. 10. das reicht, oder?! Begins with a Brian from the 80s
  6. 12. what Michael reads every week (not cryptic)
  7. 14. feller messes up "an exam" ("messes up" has same meaning as in )
  8. 16. all of them + the loneliest number
  9. 17. pig residence then the word "is" inside a type of lightbulb
  10. 19. pancake and paper decoration
  11. 23. a stud (ein Ständer) pulverised and laid on the floor