Having completed the grid unambiguously, I have some uncertainty about three of the original answers. In 7ac and 16dn, there are different answers depending on whether the prime that has to be removed comes at the beginning or the end of the original answer. In 12ac, the prime could come in any of four positions, as the digit sum is invariant to how the digits are arranged.
Have I missed something that would resolve the ambiguities? It doesn't matter for the final grid, and perhaps the wording of the preamble "All answers and entries are different" does not rule out the possibility of multiple answers to individual clues.