Stuck on left-hand top corner, thus- 1 ac - NY's X-four, say (5,6) - ??m?s ?????e 1 dn - Verge - whip past it (9) - ??r?????d 4 dn - Element of dentistry, making fast money (11) - ??i?????v?r 16ac - Coat of half-twisted arms? (9) - ??e?p???? Also, if 8 down is 'frail' and 28 down is 'star sign', can anyone tell me why, please?