Managed to interrupt Tory leader once making aggressive speech (8)
I believe the answer is:
harangue
'aggressive speech' is the definition.
(I've seen this before)
'managed to interrupt tory leader once' is the wordplay.
'managed' becomes 'ran' (both can mean organised or was in charge of).
'to interrupt' is an insertion indicator.
'tory leader once' becomes 'Hague' (William Hague, former Conservative Party leader).
'ran' inserted within 'hague' is 'HARANGUE'.
'making' acts as a link.
(Other definitions for harangue that I've seen before include "Declamation - lecture" , "Loud and agressive speech" , "Highly charged speech" , "Deliver a forceful speech" , "A lengthy speech or diatribe" .)