Crazy lament (6)

I believe the answer is:

mental

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'crazy' is the definition.
(mentally ill)

'lament' is the wordplay.
'lament' can be anagrammed to 'MENTAL'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for mental that I've seen before include "like brain operation" , "off trolley" , "Lament (anag) - of the mind" , "Done in the mind" , "Relating to the mind" .)

I've seen this clue in The Globe and Mail.

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