---

All answers having "Pen name" as clue:

3 Character Answers:

---

BIC

RHO

STY



4 Character Answers:

---

ELIA



5 Character Answers:

---

ALIAS

CROSS

FLAIR



6 Character Answers:

---

PARKER



9 Character Answers:

---

PSEUDONYM



10 Character Answers:

---

ERASERMATE

NOMDEPLUME