27A. Desert a party in NI river (7). A*A*D*N. Had thought it should be 'Arabian' but I'm pretty sure the D is correct (for 19D I've got 'Stardom' and the 17A link in the clue is 'Darts')
Many thanks everyone. Should have got that, especially since I was born in Bandon (Co. Cork) though I've lived in London for most of the last 65 years.