Crossword Genius

Cook can't use fruitcake (7)

Ross

I believe the answer is:

nutcase

'fruitcake' is the definition.
(I've seen this before)

'cook can't use' is the wordplay.
'cook' indicates an anagram.
'cant'+'use'='cantuse'
'cantuse' anagrammed gives 'NUTCASE'.

(Other definitions for nutcase that I've seen before include "Eccentric" , "Slangily, a crazy person" , "bananas" , "fool" , "Crank" .)

I've seen this clue in The Independent.
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