FBI agent (1-3)
I believe the answer is:
g-man
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fbi agent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for g-man that I've seen before include "FBI agent" , "Officer of the FBI in USA" .)