Tirade tore into Dutch capital (8)
I believe the answer is:
harangue
'tirade' is the definition.
(I've seen this before)
'tore into dutch capital' is the wordplay.
'tore' becomes 'ran' (I've seen this before).
'into' is an insertion indicator.
'dutch capital' becomes 'hague' (The Hague is a city in the Netherlands. I am not sure about the 'dutch' bit.).
'ran' put inside 'hague' is 'HARANGUE'.
Can you help me to learn more?
(Other definitions for harangue that I've seen before include "Highly charged speech" , "A lengthy speech or diatribe" , "Forceful and aggressive speech" , "Loud angry speech" , "Hectoring lecture" .)