---

All answers having "Reserved" as clue:

3 Character Answers:

---

COY

SHY



4 Character Answers:

---

COOL

KEPT

SEAT



5 Character Answers:

---

ALOOF

ONICE

SOBER

STAID

TAKEN



6 Character Answers:

---

BOOKED

DEMURE

MODEST

SEDATE

SPOKEN



7 Character Answers:

---

DISTANT

INDRAWN

PRUDISH



8 Character Answers:

---

RETICENT

RETIRING

SETASIDE

TACITURN



9 Character Answers:

---

BOTTLEDUP

EARMARKED

LAIDASIDE

SPOKENFOR

WITHDRAWN



15 Character Answers:

---

UNDEMONSTRATIVE