Double trouble

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Across
  1. 3. In the manner of jelly on a plate
  2. 6. Headlice demonstrates determination and courage
  3. 8. Rocky Horror character sits butt-naked in sauna
  4. 11. Swinging at windmills
  5. 12. Morphological process found in ablaut, rhyming, and exact forms in this puzzle’s solutions
  6. 16. New England siblings summon the Divine Miss M et al.
  7. 17. Changing tone and frequency on an electric guitar? That’s a pedaling.
Down
  1. 1. One limb at a time: that’s what it’s all about
  2. 2. Confidence man pulls one over on Clark Kent
  3. 4. Sun safety advice from lisping seagull of 80s Australian television
  4. 5. Timely chatter
  5. 7. Pattern created by turning solution’s first letter 90°
  6. 9. Benjiamin takes a chance, gets cut in half
  7. 10. Oof! This fiddler is cranky
  8. 13. Commence with an Italian salute
  9. 14. Making mischief with a nasal napkin
  10. 15. Dog breed originating in Northern China is what it eats