'Knock-knock' by Torquemada

 'Knock-knock' by Torquemada

To save space, it must be imagined that each italic clue has been prefaced by the first player saying “Knock-Knock,” the second saying, “Who’s there?” and the first replying with a given name. In the clue itself the second player asks “Given-name who?” and the first player amplifies his previous answer. E.g. “Ebenezer who?” “Ebenezer black wood.” “Eulalia who?” “Eulalia nate my affections” “Cecilia who?” “Cecilia game than I thought”.

ACROSS
  l. “Blank who?' “Blank sitting down a minute?'
 7. “Blank who?” “Blank love to”.
 14. “Blank who?” “Blank no-how”.
 15 rev. Lear had a runcible one.
 16. Mulde contributes to me.
 17. It’s awkward to find the Lord Chancellor upside down in the street on a rainy   day.
 19. Plant obtainable from high ground overlooking a river valley.
 22 rev. A theocracy.
 23. Wore a russet mantle in Shakespeare.
 25. Out of the eater came forth meat.
 26. Food for his repasture for his den.
 28. A peep into taste.
 29. See 33.
 30. “Blank who?' 'Blank terrible state of affairs”
 31 rev. 54.
 32. “Blank who?' “Blank fool and caught a cold”
 35 & 42. “Blank who?' “Blank the bounds of possibility”.
 37. “Blank who?' “Blank out and do it again”.
 39. Vowels of 53.
 40. “Blank who?” “'Blank by a tiger”.
 44 & 48. Make a song about it.
 46. “Blank who?” “Blank ute ickle sing”.
 49. “Blank who?' “Blank. where is fancy bred?”
 53. Creeper formed of Edmund and his son Charles.
 55. “Blank who?' “Blank pants, make you another pair”.
 56 rev. Better in character than sugar.

DOWN
 1. & 9. “Blank who?' “Blank a wireless?
 2 rev. Brownsea island is in this harbour.
 3. & 9. “Blank who?' “Blank note of it”.
 4. “Blank who?” “Blank attack of itch”.
 6. “Blank who?” “Blank fool, aren't you?”
 7. rev.  & 5. Volume of a particle of dust.
 8. “Blank who?' “Blank I haven't had a drink all day”.
 10. Room for a 25
 12. & 11. “Blank who?” “Blank and a small stout”
 13 & 9. “'Blank who?” “Blank ropodist called about my corns?'
 18. My small brother goes round the meadow.
 20 rev. 27
 21. I'm in from the sign.
 23. rev. “Blank who?” “Blanks pictures”
 24. rev. Impetus
 26.  rev. “Blank who?' 'Blank mow the lawn”.
 27. “on Ararat there grew a vine; When … from her bathing rose”.
 33. Gets into a 26 ac. with 29.
 34. “Blank who?' “Blank ephant never forgets”.
 36. With or may say without if you are slow to learn.
 38. “Blank who?” “Blank who waits”.
 39. My first is unchecked in 28, and my second in 13, 21, 23 dn., 52 and 55.
 40. & 52. “Blank who?” “Blank did me wrong”.  
 41. More than the reverse of negative colours.
 43. ... dim … red, like God's own head'.
 45 rev. There can be a chick before and a hen behind.
 50. & 47. Almost poached rat.
 51 rev. First half of 41.
 52 rev. 39 do.
 54. rev. 31