Taking one unchecked letter from each across solution gives EXTRAORDINARY RENDITION, whose victims, according to Chambers 2011, include TERRORIST SUSPECTs. The initial letters of unclued entries were S,T,R,R,T,I,E,R,O.
 
First prize Michael Debenham, Shrewsbury
Runners-up Mrs Jane Smith, King’s Lynn; Jamie Staveley, London SW15