---

All answers having "Invent" as clue:

4 Character Answers:

---

COIN

MINT

TACK



5 Character Answers:

---

FEIGN



6 Character Answers:

---

CREATE

DESIGN

DEVISE

HURTLE

MAKEUP



7 Character Answers:

---

CONCOCT

DREAMUP

THINKUP



8 Character Answers:

---

CONTRIVE

DISCOVER



9 Character Answers:

---

FABRICATE