Particular sci-fi film seized by Irish legislators (6)
I believe the answer is:
detail
'particular' is the definition.
('detail' can be a synonym of 'particular')
'sci-fi film seized by irish legislators' is the wordplay.
'sci-fi film' becomes 'et' (I've seen this in other clues).
'seized by' indicates putting letters inside.
'irish legislators' becomes 'dail' (Irish parliament).
'et' placed within 'dail' is 'DETAIL'.
(Other definitions for detail that I've seen before include "Factor" , "A small part of something" , "Small or important part" , "Small part of the whole" , "analysts may go into" .)