5d Russian girl, one with title again spurning me (5) I?N?A (not certain though of my I and N)
17d ... re-entering, circumvent water plant (7) S???R??
(This clue follows on from 16d Source of poison exhibited in court, along with kind of skirt.... (7) I have WOORARA for the answer
19d Agent changing last letter for the author's final words (5) Is it envoY changes to envoI or the other way round. I "think" the defn is author's last words so it would be envo i ???
26a Enough Shakespeare! (5) ?E?T?