I accept that CIA IS CLUE is an anagram and I have it worked out so far as C?E?I?I?L {if Left is the correct answer to 19a "The side of James" [ if it is soft then S would replace L]} That leaves me with the remaining letters of ASCU ( or ALCU) I have been through every permutation in Chambers and cannot find anything to do with Cambridge Latin Course or Banker - have your any more ideas which could help?