Company outing abandoned by Jack with indifference (6)

I believe the answer is:

coolly

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'abandoned by jack with indifference' is the definition.
I can't judge whether this definition defines the answer.

'company outing' is the wordplay.
'company' becomes 'co' (abbreviation).
'outing' becomes 'olly' (I am not sure about this - if you are sure you should believe this answer much more).
'co'+'olly'='COOLLY'

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(Another definition for coolly that I've seen is " with reserve".)

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