Ev 1544

[tedsgran]

Four normal clues lead to thematic answers, each producing a single-letter clash in one cell when entered. From the answer to every other clue a letter must be deleted wherever it appears before entry into the grid
30a Lord and servants frequently grasp the meaning of Cooper's autobiography (10, 3 words)
L?M????G?T
19a Earl to blacken revolutionary attempt to defeat by treachery (4) ?N??

[RickGDG]

30a ld men frget, Duff Cooper's autobiography with the 'o' s removed. Lord (ld) servants (men) frequently (fr) grasp the meaning of (get).
29a I think is knie, fink reversed over e for definition knife minus the f.

[RickGDG]

Actually I think my parsing of 19a must be wrong.

[tedsgran]

Thank you RickDGD

[ProfessorMaisie]

19a 'to blacken' = INK.

[tedsgran]

Thank you ProfessorMaisie...all sorted now