---

All answers having "In working order" as clue:

3 Character Answers:

---

AOK



5 Character Answers:

---

NERVE

UTILE



6 Character Answers:

---

USABLE



8 Character Answers:

---

FRAGMENT

GRADIENT

OPERABLE



9 Character Answers:

---

OPERATING

OPERATIVE



11 Character Answers:

---

OPERATIONAL