Inability to speak of misshapen summit (6)
I believe the answer is:
mutism
'inability to speak' is the definition.
'misshapen summit' is the wordplay.
'misshapen' indicates anagramming the letters.
'summit' is an anagram of 'MUTISM'.
'of' is the link.
(Another definition for mutism that I've seen is " Unwillingness to speak".)
I've seen this clue in The Guardian.
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