Believe to be guilty (7)
I believe the answer is:
suspect
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">believe to be guilty</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for suspect that I've seen before include "Fancy" , "Have qualms about" , "One believed responsible" , "Fishy" , "Presume" .)