Eject some notorious terrorist (4)
I believe the answer is:
oust
'eject' is the definition.
(thesaurus)
'some notorious terrorist' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'OUST' is hidden in the letters of 'notorious terrorist'.
(Other definitions for oust that I've seen before include "Expel (from a place)" , "Turn out" , "responsible for expulsions" , "Get rid of" , "Give marching orders" .)