Thinks deeply about kind heart and more negative qualities (7)

I believe the answer is:

minuses

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'more negative qualities' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'thinks deeply about kind heart' is the wordplay.
'thinks deeply' becomes 'muses' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'heart' indicates the central letters.
The central letters of 'kind' are 'in'.
'muses' going around 'in' is 'MINUSES'.

'and' is the link.

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I've seen this clue in the Sydney Morning Herald.

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