---

All answers having "Doing" as clue:

3 Character Answers:

---

ACT

UTO



4 Character Answers:

---

DEED

INSO

UPTO



5 Character Answers:

---

UPAND



6 Character Answers:

---

AFFAIR



8 Character Answers:

---

ACTIVITY



9 Character Answers:

---

IMITATING

UPANDATIT