Get really angry about inn's low interior (4,2)
I believe the answer is:
blow up
'get really angry' is the definition.
I can't judge whether this definition defines the answer.
'about inn's low interior' is the wordplay.
'about' is a reversal indicator.
'inn' becomes 'pub' (both can mean a drinking establishment).
'interior' is an insertion indicator.
'pub' back-to-front is 'bup'.
'bup' going around 'low' is 'BLOW-UP'.
Can you help me to learn more?
(Other definitions for blow up that I've seen before include "high wind?" , "Explode or lose temper" , "go off" , "reduce to smithereens" , "Explode - 19" .)