Nothing writer cared about was objective (4-6)

I believe the answer is:

open-minded

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'objective' is the definition.
(thesaurus)

'nothing writer cared about' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'writer' becomes 'pen' (something which writes).
'cared about' becomes 'minded' (I've seen this before. I am not sure about the 'about' bit.).
'o'+'pen'+'minded'='OPEN-MINDED'

'was' is the link.

Can you help me to learn more?

(Other definitions for open-minded that I've seen before include "Unprejudiced, receptive" , "Willing to consider new ideas" .)

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

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