In the character of the aunt, is miscast again (6)
I believe the answer is:
nature
'in the character of' is the definition.
I can't judge whether this definition defines the answer.
'aunt is miscast again' is the wordplay.
'is miscast' indicates an anagram.
'again' becomes 're' (prefix meaning 'again').
'aunt' with letters rearranged gives 'natu'.
'natu'+'re'='NATURE'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for nature that I've seen before include "Tea-urn for outdoors" , "Essence; kind" , "Character - our Mother" , "Character, disposition" , "Kind - disposition" .)