Search for tiny amount (5)
I believe the answer is:
trace
I believe this clue is a double definition.
'search for' is the first definition.
(I've seen this in another clue)
'tiny amount' is the second definition.
(I've seen this before)
(Other definitions for trace that I've seen before include "Evidence" , "Follow step by step" , "suspicion" , "part of harness" , "strap for drawing carriage" .)