Misery, one arm being broken (6)
I believe the answer is:
moaner
'misery' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'one arm being broken' is the wordplay.
'being broken' indicates anagramming the letters.
'one'+'arm'='onearm'
'onearm' with letters rearranged gives 'MOANER'.
Can you help me to learn more?
(Other definitions for moaner that I've seen before include "Grouch" , "Grumbler" , "One who complains" , "Complainer" .)