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One who's barking having sex change wants a throwing stick (7)

Ross

I believe the answer is:

woomera

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'one' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I can't see?

I don't understand the remainder of the clue.

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(Other definitions for woomera that I've seen before include "South Australian town" , "spear-launcher" , "Aborigine spear stick" , "stick with extra ooph!" , "range of Australians" .)

I've seen this clue in The Independent.
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