Heard this trade rumor before and from the Jazz stand point it makes no sense.
For one PHX has been trying to trade Crowder all off season and either the market is cool on him or PHX is asking too much for him. Either way I see no reason why all of a sudden the Jazz would give up a positive asset that is Clarkson for a lesser asset that is Crowder, not to factor in why would the Jazz help PHX be a stronger contender and without getting more compensation from PHX.
This is a business. This is not a charity. Maybe one day UNICEF will get into the NBA trade business. But until then, there is nothing to see on this trade rumor.