I have a clash which does not seem to be resolvable using the 'two treatments'. I have what seem to be indisputable answers for 41a and 42d and they are both straightforward clues. However, they clash, and 41a also clashes with 38d.
The only possible way out this dilemma is that 41a is one of the entries which needs treating. However, even if that were the case, the only plausible entry is not in Chambers, though I cannot help feeling that it ought to be.