Insanity, oddly enough, is not minimised (4)

I believe the answer is:

isnt

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'not minimised' is the definition.
I can't tell whether this definition defines the answer.

'insanity oddly enough' is the wordplay.
'oddly enough' indicates alternate letters.
The alternate letters of 'insanity' are 'ISNT'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for isnt that I've seen before include "denial?" , "Ain't" , "Does not happen to be" , "- - This A Lovely Day? (song)" , "When abridged, has none of the quality of" .)

I've seen this clue in The Times.

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