The Reference Desk/DWM issue 454 crossword

From Tardis Wiki, the free Doctor Who reference

can anyone please help with the following unsolvable,impossible clues.

26 across - accessory favoured by hc clements - s*a*s

28 across - possible acronym for organisation run by one of the doctor's former companions - a**

PLEASE HELP ME BEFORE I GO ABSOULTELY INSANE

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