Thanks for help received so far. I now have an unsolved clue as one of the answers given makes one of my solutions wrong so..."The Wrong Box" finishes with viral problems (1-6) I have X ?O?I?S
It's QUENCHLESSLY - only Araucaria would think of this - not exactly a word used on a regular basis! It's QUEEN minus letter E then CHESS for game with an L for pupil - then LY for lycee (this last reason is a guess)