What is the crossword answer for the clue: Undercover agent

SPY - a 3 letter word may be the answer you are looking for!

NARC - a 4 letter word may be the answer you are looking for!

NARCO - a 5 letter word may be the answer you are looking for!

PLANT - a 5 letter word may be the answer you are looking for!

MOLE - a 4 letter word may be the answer you are looking for!

Undercover agent

3 Character Answers:

SPY

4 Character Answers:

MOLE

NARC

5 Character Answers:

NARCO

PLANT