Interesting to note the problems caused by Round 15. It's really essential to work out the wordplay because crossword solving aids don't list the word in a plural form. It's not given by TEA, and even when I guessed what the last five letters might be, Chambers CD partial word search failed to provide the answer, making me think my guess was wrong and the word was a Latin plural ending in A. That suggests that Chambers does not consider it a word to be pluralised, though I can't see why that should be.
It was a magnificent achievement to create such a grid without any ambiguities, and the clues are excellent, and very fair, but I confess to finding sorting out overlapping jumbles of 12-letter words a fiddly and unrewarding chore that played havoc with my eyes.