Crossword Genius

Mother, awfully sad at heart, is absolutely crazy (3,2,1,6)


I believe the answer is:

mad as a hatter

'absolutely crazy' is the definition.

'mother awfully sad at heart' is the wordplay.
'mother' becomes 'ma' (ma is a kind of mother).
'awfully' is an anagram indicator.
'sadatheart' with letters rearranged gives 'dasahatter'.
'ma'+'dasahatter'='MAD AS A HATTER'

'is' is the link.

(Other definitions for mad as a hatter that I've seen before include "Crazy" , "Completely daft" , "Totally daft" , "Sun-orbiting body" , "Completely insane (informal)" .)

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