Join Date: Dec 2009
Posts: 27,820
Tube was a transit word, so I think it makes it more likely that sub=subway? Not really sure about that, but makes sense. I don't think he'd risk us guessing it if it was assassin now anyway, since we had it as backup. Crash works for both, but if we guess that first then I don't think we can really be sure what clue it was for (unless there's overlap).
And yeah, I guess ring is a frontrunner for wireless, but it's still a couple of steps away from the clue just like everything else seems to be. Not sure it's that much better than a couple of the other options you mentioned.
There's also (fire)stick and black(berry), but they are probably easier to miss. And don't forget about bear.