---

All answers having "Lecture" as clue:

4 Character Answers:

---

BAWL

TALK



5 Character Answers:

---

ORATE

SCOLD

SPEAK

SPIEL



6 Character Answers:

---

PREACH

READTO

REBUKE

SERMON

TALKAT

TALKTO



7 Character Answers:

---

ADDRESS

EDUCATE

ORATION



8 Character Answers:

---

HARANGUE