2: Gold cot in rummage sale (7)
5: Bolted up tiptop earthenware (5)
7: 4-down Arias hit high note in some of the lungs (3,3)
9: Nice work - point out the beginning (9)
10: Terrier shows how to stray (3)
11: 'Log-in failed', in technical terms (5)
12: Turncoat's first motive for disloyalty (7)