Not making much headway with this at all.
Clues contain an extra or missing letter in the wordplay OR a misprint in the defn. Then some answers have to be altered before entry in grid.....so crossers and even grid length may not be of much help...
13d practical treatment of tooth wanted no end of cement (11)
18a Triumph over congress in the last month (7)
27a They transport Bill and alpacas cruelly leaving Alabama (9, two words)