Don't normally get stuck on the quick one, but ......
23a. Drop In (6) ?N?T?L
4a. Desolate (7) ?O?????
9a. Most low (7) ?E?????
11a. Bent (6) I?????
6d. Extent (6) no letters yet, but 1st letter is 4th letter of 4a. 3rd letter is 4th letter of 9a and 5th letter is 3rd letter of 11a.
7d. Tale ill (6) no letters yet, but 1st letter is 6th letter of 4a. 3rd letter is 6th letter of 9a and 5th letter is 5th letter of 11a.