Tolerant old writer cared (4,6)

I believe the answer is:

open minded

'tolerant' is the definition.
(thesaurus)

'old writer cared' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'writer' becomes 'pen' (something which writes).
'cared' becomes 'minded' (I've seen this before).
'o'+'pen'+'minded'='OPEN-MINDED'

(Another definition for open minded that I've seen is " prepared to learn".)

I've seen this clue in The Daily Mail.

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