Show appalling act with bear (7)
I believe the answer is:
cabaret
'show' is the definition.
(cabaret is a kind of show)
'appalling act with bear' is the wordplay.
'appalling' is an anagram indicator (an appalling spelling of the letters).
'with' is a charade indicator (letters next to each other).
'act' after 'bear' is 'bearact'.
'bearact' is an anagram of 'CABARET'.
(Other definitions for cabaret that I've seen before include "Entertainment provided in a nightclub" , "In nightspot" , "Floor show and name of great musical" , "Nightclub 12ac" , "Evening entertainment as in nightclub" .)