Initial lack of judgement's possibly done MP in (4,4)

I believe the answer is:

open mind

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'initial lack of judgement's' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'possibly done mp in' is the wordplay.
'possibly' indicates an anagram.
'done'+'mp'+'in'='donempin'
'donempin' with letters rearranged gives 'OPEN MIND'.

Can you help me to learn more?

(Another definition for open mind that I've seen is " Keep an .... .... so as not to be prejudiced".)

I've seen this clue in The Independent.

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