23 seems to be a reference to the three sisters in Macbeth, known as the Weird Sisters, an order of witches. Having said that I’m not quite sure how the clue is intended to work…
Whetstone ... autocorrection has a lot to answer for- it should be called automistake!
I think 'odder' is the def in 23 - not the greatest clue but ... strange that the weird sisters were members of an 'order'