Cryptanalyst Turing (4)
I believe the answer is:
alan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cryptanalyst turing</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alan that I've seen before include "-- Turing, English computer scientist" , "One of Robin Hood's men was - a Dale" , "Boy's name" , "- Bates, - Bennett" , "English historian/poet" .)