Horrid canine caged by horrid tanner (9)
I believe the answer is:
repugnant
'horrid' is the definition.
(thesaurus)
'canine caged by horrid tanner' is the wordplay.
'canine' becomes 'pug' (pug is a kind of dog).
'caged by' is an insertion indicator.
'horrid' is an anagram indicator.
'tanner' is an anagram of 'renant'.
'pug' inserted inside 'renant' is 'REPUGNANT'.
(Other definitions for repugnant that I've seen before include "vile" , "Disgusting" , "Loathsome" , "Unacceptable" , "Abhorrent" .)