Track down (6)
I believe the answer is:
locate
'track down' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for locate that I've seen before include "Discover the position of something" , "Lay one's hands on (something)" , "Find out where something is" , "Discover the place where something is" , "Find, or establish in particular place" .)