---

All answers having "Spy" as clue:

3 Character Answers:

---

CAM

SEE



4 Character Answers:

---

EYER

HARI

MOLE

SPOT



5 Character Answers:

---

AGENT

CREEP

ESPIA

GLASS

PLANT

SNOOP

TAPER



6 Character Answers:

---

PEEKER



7 Character Answers:

---

ENCODER

RELIEVE

RESTART

SNOOPER



9 Character Answers:

---

OPERATIVE



10 Character Answers:

---

ENEMYAGENT



11 Character Answers:

---

SECRETAGENT



14 Character Answers:

---

CLOAKANDDAGGER



15 Character Answers:

---

COVERTOPERATIVE

UNDERCOVERAGENT