Make dramatic mistake in assessing character (7)
I believe the answer is:
miscast
'make dramatic mistake in assessing character' is the definition.
I can't judge whether this defines the answer.
'assessing character' is the wordplay.
'assessing' becomes 'mis' (I can't justify this - if you can you should believe this answer much more).
'character' becomes 'cast' (I've seen this before).
'mis'+'cast'='MISCAST'
Can you help me to learn more?
(Other definitions for miscast that I've seen before include "Of actor, unsuited to a role" , "Given an unsuitable part" , "Give an unsuitable role" , "in the wrong film?" , "having the wrong part" .)