Hi chrise. I found this tricky too. I don’t have a problem with 4a, but I don’t like 9a. Chambers gives rely upon for one of the definitions of reckon (who knew?), so I suppose 11a is ok. I don’t have a problem with 16a. 6d is a rather loose definition imo. 10d is an unusual (to me at least) usage of the solution; again, a bit loose. I think we all agree that 25a is an error.
All the best.