Rage not, strangely, in NI Parliament (8)
I believe the answer is:
stormont
'ni parliament' is the definition.
(I've seen this before)
'rage not strangely in' is the wordplay.
'rage' becomes 'storm' ('storm' can be a synonym of 'rage'**).
'strangely' indicates an anagram.
'in' indicates putting letters inside.
'not' anagrammed gives 'ont'.
'storm' going into 'ont' is 'STORMONT'.
(Other definitions for stormont that I've seen before include "Seat of Northern Ireland government" , "Seat of Northern Ireland assembly" , "N. Ireland parliament" , "Name for the Northern Ireland Assembly" , "Was seat of government in N Ireland" .)