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2d The ultimate in counterfeit Eastern currency - conduct test (5,3)
5d Lonely one reprimanded about nothing (8)
17d Girl's pottery beginning to sell unexpectedly (8)
18d British alias assumed by Kate's foreign granny (8)

18 Babushka, Russian (foreign) granny. B, British, AKA, also known as , alias, with Bush, Kate Bush, inside. B a Bush ka.

2 Trial Run, test.

T, from the end of 'counterfeit',
Rial, Eastern currency
Run, conduct.

5. Isolated, lonely. I, one, slated, reprimanded, with O, nothing, put inside.

17 Unawares, unexpectedly. Una, girl, Ware, pottery and S(ell), beginning to sell.