by FinVortex
well as much as i know psychic probe interfere after the player (who its his turn) roll his dice and use any of his cards and declare the dice as his final play. THEN it is time for any other player to make a play against him just before he score or attack or heal.so i believe Clown Costume is a card played within the players turn since the royal flush itself is not the declared final dice.
EXAMPLE
when i use "Giant Brain Card" (which gives my 1 extra reroll each of my turns) I use it within my turn as a third reroll after my normal two rerolls then any other player can interfere AFTER i declare the dice as my final play and not before that.
at least this is how my brain works