Australian climber, wearing a clog, breaks leg (10)
I believe the answer is:
phascogale
'australian climber' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'wearing a clog breaks leg' is the wordplay.
'wearing' indicates anagramming the letters (wear can mean to become damaged).
'breaks' is an insertion indicator (inserted letters break into the word).
'leg' becomes 'phase' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'clog'='aclog'
'aclog' anagrammed gives 'cogal'.
'cogal' placed within 'phase' is 'PHASCOGALE'.
Can you help me to learn more?