Detective (6)
I believe the answer is:
sleuth
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">detective</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that sleuth is a type of detective)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sleuth that I've seen before include "Bloodhound" , "Gumshoe" , "Track" , "Investigator (informal)" , "Holmes, for one" .)