---

All answers having "Rapidity" as clue:

3 Character Answers:

---

EWE



4 Character Answers:

---

DAMP



5 Character Answers:

---

HASTE

HEIST

SPEED

ULCER



6 Character Answers:

---

DEFEAT



7 Character Answers:

---

JOURNAL

SUCCOUR



8 Character Answers:

---

CELERITY

IDEALIST



12 Character Answers:

---

OLDMANSBEARD