Dog's home supported by judge in Ulster (7)
I believe the answer is:
basenji
'dog's' is the definition.
(basenji is a kind of dog)
'home supported by judge in ulster' is the wordplay.
'home' becomes 'base'.
'supported by' is a charade indicator (letters next to each other) (letters go below - in down clue).
'judge' becomes 'j' (abbreviation for judge).
'in' indicates putting letters inside.
'ulster' becomes 'ni' (Northern Ireland).
'j' going into 'ni' is 'nji'.
'base'+'nji'='BASENJI'
(Other definitions for basenji that I've seen before include "Smallish hunting dog" , "Barkless dog" , "Dog unable to bark" , "Breed of African hunting dog that rarely barks" , "Small hunting dog" .)