One who's barking having sex change wants a throwing stick (7)
I believe the answer is:
woomera
'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.
Can you help me to learn more?
(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" .)