Delusions of persecution (8)
I believe the answer is:
paranoia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">delusions of persecution</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for paranoia that I've seen before include "Disorder characterised by delusions of persecution or grandeur" , "Mental disorder characterised by delusions of persecution" , "Irrational fear or suspicion" , "Disorder characterized by delusions of persecution" , "Feeling of persecution" .)