Thinking about it in carriage, I can look after ..... (7,2,2,4)

I believe the answer is:

bearing it in mind

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'thinking about it' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'in carriage i can look after' is the wordplay.
'in carriage' becomes 'bearing' (I can't explain this - if you can you should give a lot more credence to this answer).
'can' becomes 'tin' (both are metal containers).
'look after' becomes 'mind' (I've seen this in another clue).
'bearing'+'i'+'tin'+'mind'='BEARING IT IN MIND'

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

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