---

All answers having "Warning device" as clue:

3 Character Answers:

---

TEE



4 Character Answers:

---

HORN



5 Character Answers:

---

ALARM

AMASS

FLARE

LAITY

RADAR

RAITA

SIREN



6 Character Answers:

---

INDIGO



7 Character Answers:

---

EMINENT



8 Character Answers:

---

TELLTALE



9 Character Answers:

---

ALARMBELL

FIREALARM



10 Character Answers:

---

SMOKEALARM



11 Character Answers:

---

IRREVOCABLE



13 Character Answers:

---

GOODSAMARITAN