---

All answers having "Concern" as clue:

4 Character Answers:

---

CARE

FIRM

OFNO



5 Character Answers:

---

ALARM

WORRY



6 Character Answers:

---

AFFAIR

AGOING

BEARON

MATTER

REGARD



7 Character Answers:

---

INVOLVE

PERTAIN



8 Character Answers:

---

INTEREST

MATTERTO