Poor, upset, frequently confined, in a situation for shouting? (7)
I believe the answer is:
rooftop
'a situation for shouting?' is the definition.
(as in shouting from the rooftops)
'poor upset frequently confined in' is the wordplay.
'upset' says the letters should be written backwards.
'frequently' becomes 'oft' (oft can mean frequently, eg oft-quoted).
'confined in' means one lot of letters goes inside another.
'poor' backwards is 'roop'.
'roop' going around 'oft' is 'ROOFTOP'.
(Other definitions for rooftop that I've seen before include "Highest point of house" , "Domestic vantage point" , "High place in a building (from which to shout?)" , "may get slated?" , "High point of building (from which to shout?)" .)