In fact, a terrible bigot (7)
I believe the answer is:
fanatic
'bigot' is the definition.
(thesaurus)
'in fact a terrible' is the wordplay.
'terrible' indicates anagramming the letters.
'in'+'fact'+'a'='infacta'
'infacta' is an anagram of 'FANATIC'.
(Other definitions for fanatic that I've seen before include "Obsessive enthusiast" , "Overzealous person" , "One who is excessively zealous" , "Excessively devoted" , "Zealot or extremist" .)