Secret agents (5)
I believe the answer is:
spies
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">secret agents</span>' is the definition.<br/ ><span class="explanation-format__explanation">(spy is a kind of secret agent)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for spies that I've seen before include "Undercover agents" , "Eg, CIA" , "Double agents" , "Snoops" , "Secret agents" .)