Feel doubt (7)
I believe the answer is:
suspect
I believe this is a double definition.
'feel' is the first definition.
(thesaurus)
'doubt' is the second definition.
('suspect' can be a synonym of 'doubt')
(Other definitions for suspect that I've seen before include "Possible criminal - doubtful" , "Imagine guilt" , "Believe to be guilty, but without proof" , "Doubt - man being questioned by police" , "Hazard a guess" .)