---

All answers having "Watchman" as clue:

4 Character Answers:

---

EYER



5 Character Answers:

---

GUARD



6 Character Answers:

---

SENTRY

WARDER



7 Character Answers:

---

LOOKOUT



8 Character Answers:

---

SENTINEL



9 Character Answers:

---

CARETAKER

HOROLOGER