---

All answers having "Regrettably" as clue:

4 Character Answers:

---

ALAS



5 Character Answers:

---

SINUS



6 Character Answers:

---

ESSAYS

STINGY



7 Character Answers:

---

YFRONTS



8 Character Answers:

---

AFRAIDSO

SADTOSAY



11 Character Answers:

---

SIRLANCELOT