Try to find a kind of warrant (6)
I believe the answer is:
search
This clue is a double definition.
'try to find' is the first definition.
(I've seen this before)
'a kind of warrant' is the second definition.
(I've seen this in another clue)
(Other definitions for search that I've seen before include "thorough examination" , "Seek carefully (for something)" , "Look through - arches (anag)" , "investigation . . . ." , "Examine (to find something)" .)