Missed having part exchange reviewed (6,4)

I believe the answer is:

looked over

'reviewed' is the definition.
(to look over something is to review it)

'missed having part exchange' is the wordplay.
I cannot really see how this works, but
'part' could be 'do' (do is a kind of part) and 'do' is found within the answer.
This explanation may well be incorrect...

I've seen this clue in The Guardian.

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