The primary one could possibly be adequate so far as the explicitly requested query goes. That’s, “John” can be an appropriate definition. (though it really works higher with barely much less frequent names.)
Nevertheless, I do not actually just like the wordplay. There’s nothing to point HAVOC as anagram fodder. “Enjoying havoc with spilt milk” is best, nevertheless it nonetheless is not excellent in that “with” is normally a be part of, so you find yourself cluing “HAVOC* + MILK*” — Which might be high-quality if every anagram made up part of the phrase, like VACHO + KILM (which is a nonsense instance) What you need to clue is “[HAVOC + MILK]*”. – that’s, be part of the fodder into one unit then anagram it.
Personally, I feel the final one is just too obscure for most individuals. BUT if it was a part of a theme puzzle on Con-Air, the place you additionally had CAGE and CUSACK as solutions within the grid, it will most likely be completely high-quality.
Possibly attempt one thing alongside the strains of “John taking part in havoc with milk” however the floor studying is not as good.