ALL VUL, I am South (always in this blog), West dealer. ONE SPADE. Partner DOUBLEs.
RHO THREE SPADES. No alert but clearly preemptive. Your bid?
The problem with this hand is that when it is right to raise you, partner will not know to do this with a maximum and various shapes, since you know that he wont be looking at any club honor. So you have got to bid FIVE CLUBS.
I made the mistake of bidding only FOUR CLUBS, and the opponents stole beautifully when it was PASSED OUT. I made six on a trump lead. The full hand: