I now have the quote and the authors. Have not figured out the final unclued light.
Also most of the unclueds.
Looking for hints.
I have problems with last 3 letters of 1D, 18D, 31A and 68A.
There may be an extra word in each clue.
1D. Losing idle month in cloister, behind time for putting in columns (10)
T?B?L?T???
18D. Talking wildly, ring house (6) ?A?R?S
20D. Top of liquidiser allowed to touch mouth (6) ?O?LET
31A. Room to manoeuvre, making a lace collar (6) ??R?H?
Thanks.