Discover a hint (5)
I believe the answer is:
trace
This clue is a double definition.
'discover' is the first definition.
(I know that trace is a kind of discover)
'a hint' is the second definition.
(I know that hint can be written as trace)
(Other definitions for trace that I've seen before include "Very small amount that can only just be detected" , "part of harness" , "Side strap connecting a horse to what it's pulling" , "Locate by investigation" , "Discover whereabouts" .)