Crossword Genius

Goethe's gift wasted? You really don't know, not having it (3,8)

Ross

I believe the answer is:

the foggiest

'you really don't know not having it' is the definition.
('I haven't the foggiest')

'goethe's gift wasted?' is the wordplay.
'wasted?' indicates an anagram.
'goethes'+'gift'='goethesgift'
'goethesgift' is an anagram of 'THE FOGGIEST'.

I've seen this clue in The Guardian.
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