---

All answers having "Reserve" as clue:

3 Character Answers:

---

ICE

SUB



4 Character Answers:

---

BOOK

HOLD

KEEP

SAVE



5 Character Answers:

---

CACHE

SPARE

STORE



6 Character Answers:

---

ENGAGE



7 Character Answers:

---

BACKLOG

EARMARK

FEDERAL

ICINESS

LAYAWAY

MODESTY

NESTEGG

SHYNESS



8 Character Answers:

---

COOLNESS

HOLDOPEN

SETAPART

SETASIDE



9 Character Answers:

---

ALOOFNESS

AUXILIARY

RETICENCE



10 Character Answers:

---

PUTAHOLDON