I am clearly misunderstanding the rubric, but I have some serious contradictions in the grid. Both 45a and 25d appear to be of type XYTC, so they are entered normally - but there is a clash. The same thing appears to happen with 2ac and 7d, which seem also to be XYTC clues. In fact, it is worse than that, since 7d is too long for the entry.
I think I must be wrongly assigning the correct type to both 25d and 7d, and particularly the latter.