Crossword Genius

Mental health of utter fool inside (6)

Ross

I believe the answer is:

sanity

'mental health' is the definition.
(sanity is a kind of mental health)

'utter fool inside' is the wordplay.
'utter' becomes 'say' (saying is a kind of uttering**).
'fool' becomes 'nit' (I've seen this before).
'inside' indicates putting letters inside.
'say' enclosing 'nit' is 'SANITY'.

'of' acts as a link.

(Other definitions for sanity that I've seen before include "Reason and coherence" , "Soundness of mind" , "Healthy mental state" , "Good sense" , "Mental wellness" .)

I've seen this clue in The Telegraph.
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