Has faith in cartels (6)
I believe the answer is:
trusts
This clue is a double definition.
'has faith' is the first definition.
(I've seen this in another clue)
'cartels' is the second definition.
('trust' can be a synonym of 'cartel')
'in' is the link.
(Other definitions for trusts that I've seen before include "Has faith or confidence in" , "Believes firmly in reliability of" , "Reposes confidence in" , "modern hospital managers" , "Regards as reliable" .)