Outburst that could bring aid to the people (8)
I believe the answer is:
diatribe
'outburst that' is the definition.
'diatribe' can be an answer for 'outburst' (I have seen 'abusive outburst' mean 'diatribe' so perhaps 'outburst' could also mean 'diatribe'). I'm unsure of the remainder of the definition.
'bring aid to the people' is the wordplay.
'bring aid' becomes 'dia' (I can't explain this - if you can you should give a lot more credence to this answer).
'to the people' becomes 'tribe' (a tribe is a group of people).
'dia'+'tribe'='DIATRIBE'
'could' acts as a link.
Can you help me to learn more?
(Other definitions for diatribe that I've seen before include "Bitter words" , "Bitter verbal attack" , "Lengthy harangue" , "Abusive harangue" , "A prolonged piece of invective" .)