Crossword Genius

Crack -- mentally and physically? (2,2,6)

Ross

I believe the answer is:

go to pieces

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'crack' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for go to pieces that I've seen before include "lose it?" , "Crack up" , "Break up entirely" , "Have a breakdown" , "Become so nervous as to be unable to function" .)

I've seen this clue in The Telegraph.
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