There is no clue for Mission Training, it's just to tell you what things you might come across in other missions.
There is mission 0 which would be the first mission but there is also mission 1. mission 0 clue=uranium(which is clue#11) mission 1 clue=phosphorus(which is clue#13) You can not enter clues by the way. You have to do the combos or missions.
Google it. Youtube.
Jane4
Fight
the answer is LUKE1
Jane4
Fight
If your talking about mission 0 then it is luke1
Luke4
Fight
Jane4
Fight