Kid arrested by police inspector, put away for attack (8)
I believe the answer is:
diatribe
'for attack' is the definition.
(I've seen this before)
'kid arrested by police inspector put away' is the wordplay.
'kid' becomes 'rib' (both can mean to tease or mock).
'arrested by' indicates putting letters inside (inserted letters are held or arrested).
'police inspector' becomes 'di' (I can't explain this - if you can you should give a lot more credence to this answer).
'put away' becomes 'ate' (put away can mean to eat).
'di'+'ate'='diate'
'rib' inserted inside 'diate' is 'DIATRIBE'.
Can you help me to learn more?
(Other definitions for diatribe that I've seen before include "Bitter verbal attack" , "abusive outburst" , "A prolonged tirade or abusive speech" , "'Abusive, bitter speech (8)'" , "Vitriolic speech" .)