Have really struggled today....any help with my last two will be greatly appreciated. 5A Model doing without one colour (6) ???I?O, I can only think of albino (or domino) to fit the gap but can't fit that to the clue. 6D Sonic Hedgehog holds special position in market (5) ??C?E, which gets it's first letter from the second letter of 5A. Thanks in anticipation all of you hardened answer-bankers!