Clue: Strident Australian on radio: where to buy BBQs? (10)
Answer: KOOKABURRA
Explanation: Definition: Strident Australian
A sound alike ('on the radio'); the first part is COOKER ('BBQ"), but I struggled with the second part, eventuall settling on the nearest homophone BOROUGH. At least COOKER BOROUGH hangs together in a bizarre kind of way as a 'where' that the clue requires.