Somehow other bran is loathsome (9)
I believe the answer is:
abhorrent
'loathsome' is the definition.
(thesaurus)
'somehow other bran' is the wordplay.
'somehow' indicates an anagram.
'other'+'bran'='otherbran'
'otherbran' with letters rearranged gives 'ABHORRENT'.
'is' acts as a link.
(Other definitions for abhorrent that I've seen before include "Hated" , "Obscene" , "Inspiring disgust and loathing" , "hateful" , "Odious, being earthborn" .)