Mankiest bananas emerging through error of judgement (8)
I believe the answer is:
mistaken
'error of judgement' is the definition.
'mistaken' can be an answer for 'error' (thesaurus). I'm not sure about the 'of judgement' bit.
'mankiest bananas emerging' is the wordplay.
'mankiest' anagrams to 'MISTAKEN'.
But, I'm not clear how the anagram is indicated.
'through' is the link.
Can you help me to learn more?
(Other definitions for mistaken that I've seen before include "'Wrong, misguided (8)'" , "Wrong, incorrect" , "Erroneous" , "Wrong-headed" , "Wrong in opinion, judgment etc." .)